Street Mod. - Page 42

sigterm · 07-17-2014, 03:05 PM

Willub knows this for a fact. lol

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dwx · 07-20-2014, 10:36 PM

I saw this pic someone posted in the old school forum doing an EJ22 swap and it made me have bad thoughts.

Curb weight was 2000lbs.

wrxsomeday · 07-21-2014, 08:21 AM

So speaking of weight reduction, what are some SM legal mods for weight reduction? My original plan for my car was ASP, but due to my engine rebuild, I landed squarely in SM. Fortunately my local club call "RTX" where non-stock classes can run street tires with an additional modifier to make the class more competitive for us guys not running slicks.

I know you can do a lightweight battery, racing seats, 2 piece rotors in ST* classes, and in street mod, I believe you can remove rear seats, perhaps even lightweight bumper beams...what else am I missing?

subydude · 07-21-2014, 10:18 AM

You can't do lightweight bumper beams.

It's all in the rule book. Start reading from ST through SM and it will list all the items you can replace/remove.

dwx · 07-21-2014, 10:22 AM

The rulebook has a great list of items. In short in addition to SP you can remove back seats, all radio equipment, airbags, and seatbelt stuff.

Can't replace the bumper beams.

wrxsomeday · 07-21-2014, 11:18 AM

Quote:

Originally Posted by subydude

You can't do lightweight bumper beams.

It's all in the rule book. Start reading from ST through SM and it will list all the items you can replace/remove.

I'm very aware of the rule book, and have browsed through it several times. I guess I should have phrased my question more like, what have others done with our cars specifically that they have found to be very effective for saving weight.

Quote:

Originally Posted by dwx

The rulebook has a great list of items. In short in addition to SP you can remove back seats, all radio equipment, airbags, and seatbelt stuff.

Can't replace the bumper beams.

Thanks for the ideas.

subydude · 07-21-2014, 11:39 AM

Quote:

Originally Posted by wrxsomeday

I'm very aware of the rule book, and have browsed through it several times.

If you had really read the rule book instead of just browsing you'd have seen the sections that list the items dwx mentions.

Quote:

Originally Posted by wrxsomeday

I guess I should have phrased my question more like, what have others done with our cars specifically that they have found to be very effective for saving weight.

We had a copy of the rule book out in the garage and started looking at all the parts on the car that could be changed and figured out how to make them lighter

The list of items and amount of man hours to save weight is enormous and changes from model to model (GC vs GD vs GR). What kind of budget are you working with to save weight? That alone will dictate how far you can go right now.

willub · 07-22-2014, 01:58 PM

The GR hood is steel. I'd ditch that bish. Losing the a/c in my GD dropped 22 pounds FWIW

101rs · 07-29-2014, 07:03 PM

Quote:

Originally Posted by Leafy

Its better when it catch on fire while you're racing and you have to put it out with the tire sprayer after every run.

As of this weekend, I finally own a true SM car:
(1:10 mark for the action)

YouTube (Short URL)

Power steering line let go onto the turbo and made this small fire. Lucky for me the fire was put out before any real damage was done.

Leafy · 07-29-2014, 07:14 PM

Come on rookie, you drove right over the timing light cable.

willub · 07-30-2014, 01:58 PM

Quote:

Originally Posted by 101rs

As of this weekend, I finally own a true SM car:
(1:10 mark for the action)

Power steering line let go onto the turbo and made this small fire. Lucky for me the fire was put out before any real damage was done.

Nice!

Some day I'll have a real SM car. Something is bound to let go on mine soon, but I have a feeling it will just be a ringland

subydude · 07-30-2014, 04:09 PM

The fact I use an EJ25 crank with the number 4 bearing welded in place as a door stop for my shop should be proof enough for mine

Squidz · 07-31-2014, 04:01 PM

Mine has eaten three transmissions...does that count?

subydude · 07-31-2014, 04:31 PM

Quote:

Originally Posted by Squidz

Mine has eaten three transmissions...does that count?

That counts toward you being an idiot for not using the 6-speed. And if you broke 3 6-speeds then you're still an idiot

Leafy · 07-31-2014, 04:36 PM

Quote:

Originally Posted by subydude

That counts toward you being an idiot for not using the 6-speed. And if you broke 3 6-speeds then you're still an idiot

mmmmm with a 2.5 and a real desire to win I would be in a tough decision zone between constantly blowing up 5 speed or running ****ty gearing from the 6 speed. With the 2.0 the 6 speed is a no brainer.

subydude · 07-31-2014, 05:13 PM

Quote:

Originally Posted by Leafy

mmmmm with a 2.5 and a real desire to win I would be in a tough decision zone between constantly blowing up 5 speed or running ****ty gearing from the 6 speed. With the 2.0 the 6 speed is a no brainer.

Pretty easy to solve the gearing problem IMO. I do like the gearing of the 5-speed more, and it's less weight up front. However, the DCCD and strength of the 6-speed wins in my book.

With cubic dollars it'd be even easier to fix the gearing, but I think I have a way to do low 70's in 2nd without breaking the bank. My problem is the new turbo/header this winter will break my yearly budget down to where I'll likely do the trans the following year. For now I'll have to live with 66 mph.

Leafy · 07-31-2014, 05:47 PM

The easy way to fix the gearing in 2nd with the 6 speed is to just rev over 8k.

subydude · 07-31-2014, 06:52 PM

No, the generally ends with bad things happening in the engine. The easy way is fitting the right tire, the right transmission, and some special sauce.

If I had cubic dollars I'd build a destroker, sleeved back to 2.5 liters and rev to 9.5k. However, that setup would be more than the engine/trans/rear end/diffs/clutch I have now combined.

Leafy · 07-31-2014, 06:56 PM

Why bore it back out? That displacement doesnt help you much. Stroke is what helps spool bore is just kind of there so you can get a decent shaped combustion chamber and enough valve area. I'd rather have a 2.0 and rev to 8.5 and take the 1/2liter worth of weight of of the car, than have something that spools like a 2.0 and revs like a 2.0, is capable of making a bit more top end than a normal 2.0 but has to weigh as much as a 2.5.

subydude · 07-31-2014, 06:59 PM

You're thinking in inline 4 terms. The 2.0 EJ207 doesn't spool like those, even with small short runners to a small turbo. I had one in my car, and the heads are still in the car right now. While it was great to rev to 8,400 it was a dog out of corners compared to the Evo and 2.5 STi's.

The 150 lbs I lose to the 2.0's is more than worth it on the EJ engine for that .5 liters helping with spool.

The point is to keep as much displacement as possible for power density, but the destroker for revs.

Leafy · 07-31-2014, 07:03 PM

But something with the stroke of an ej207 but bored to 2.5 is going to spool basically like a ej207. Bore doesnt have a very noticeable effect on spool.

subydude · 07-31-2014, 07:05 PM

Hmm, it seems odd to me that increasing the volume of exhaust doesn't affect spool. I'd need to read more on the subject.

Needless to say, I'm not building one because I don't have cubic dollars. I'll stick with my standard EJ257 for now.

Leafy · 07-31-2014, 07:08 PM

I'm still surprised that an EJ207 with a vvt head, efr 6758 and a low mount manifold cant be spooled by 4k rpms. A power band from 4k to 8.5k should be wide enough.

speedyHAM · 07-31-2014, 11:42 PM

Quote:

Originally Posted by Leafy

I'm still surprised that an EJ207 with a vvt head, efr 6758 and a low mount manifold cant be spooled by 4k rpms. A power band from 4k to 8.5k should be wide enough.

With the gearing available 4K is too high to start, and 8.5K is a bit too low on the top end, necessitating a shift to third on a fast course with a good car.

Unfortunately the EJ series engine has quite a few limitations that only cubic dollars can overcome (or pure madness- trust me I know

).

Hope everyone is doing well. I hope to have my car back up and running next year, but things happen, and we shall see.

Leafy · 07-31-2014, 11:54 PM

If 4k is too high for the start of the power band then your **** just doesnt handle well enough. A 5500rpm wide powerband on an auto-x car would get you power from 35mph to 72mph. If there's any turn that your car cant take on a national level course above 35mph then it handles worse than most top level stock class cars. And ****, with the 07+ sti gears and 315's on 18s or 17s you're actually closer to 75mph at 8.5k in 2nd and thats more than enough speed for anything making under 500whp at an auto-x.

07-20-2014, 10:36 PM	#1027
dwx Scooby Guru Member#: 8343 Join Date: Jul 2001 Chapter/Region: MWSOC Location: Atlanta, GA Vehicle: 2005 2012 Jeep 2013 DGM BRZ	I saw this pic someone posted in the old school forum doing an EJ22 swap and it made me have bad thoughts. Curb weight was 2000lbs. Last edited by dwx; 07-20-2014 at 10:41 PM.

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07-17-2014, 03:05 PM	#1026
sigterm Scooby Newbie Member#: 264104 Join Date: Nov 2010 Chapter/Region: HIIC Location: Hawaii Vehicle: 05 STi CGM	Willub knows this for a fact. lol * Registered users of the site do not see these ads.

07-21-2014, 08:21 AM	#1028
wrxsomeday Scooby Specialist Member#: 141991 Join Date: Feb 2007 Chapter/Region: MWSOC Location: Minneapolis, MN Vehicle: 14 FRS Ultramarine 16 Forester XT CWP	So speaking of weight reduction, what are some SM legal mods for weight reduction? My original plan for my car was ASP, but due to my engine rebuild, I landed squarely in SM. Fortunately my local club call "RTX" where non-stock classes can run street tires with an additional modifier to make the class more competitive for us guys not running slicks. I know you can do a lightweight battery, racing seats, 2 piece rotors in ST* classes, and in street mod, I believe you can remove rear seats, perhaps even lightweight bumper beams...what else am I missing?

07-21-2014, 10:18 AM	#1029
subydude Scooby Guru Member#: 80649 Join Date: Jan 2005 Chapter/Region: South East Location: Columbia, SC Vehicle: 2000 2.5 Auto-X RSTi Sparkly	You can't do lightweight bumper beams. It's all in the rule book. Start reading from ST through SM and it will list all the items you can replace/remove.

07-21-2014, 10:22 AM	#1030
dwx Scooby Guru Member#: 8343 Join Date: Jul 2001 Chapter/Region: MWSOC Location: Atlanta, GA Vehicle: 2005 2012 Jeep 2013 DGM BRZ	The rulebook has a great list of items. In short in addition to SP you can remove back seats, all radio equipment, airbags, and seatbelt stuff. Can't replace the bumper beams.

07-22-2014, 01:58 PM	#1033
willub Scooby Newbie Member#: 245695 Join Date: May 2010 Chapter/Region: NESIC Location: MA Vehicle: 04 STi silver	The GR hood is steel. I'd ditch that bish. Losing the a/c in my GD dropped 22 pounds FWIW

07-29-2014, 07:14 PM	#1035
Leafy Scooby Specialist Member#: 330625 Join Date: Aug 2012 Chapter/Region: NESIC Location: MA Vehicle: 2006 WRX WRB	Come on rookie, you drove right over the timing light cable.

07-30-2014, 04:09 PM	#1037
subydude Scooby Guru Member#: 80649 Join Date: Jan 2005 Chapter/Region: South East Location: Columbia, SC Vehicle: 2000 2.5 Auto-X RSTi Sparkly	The fact I use an EJ25 crank with the number 4 bearing welded in place as a door stop for my shop should be proof enough for mine

07-31-2014, 04:01 PM	#1038
Squidz Scooby Guru Member#: 142608 Join Date: Mar 2007 Chapter/Region: TXIC Location: Cute fuzzy cuddly kitten hell. Vehicle: 2003 Sonic Yellow Marginally well behaved.	Mine has eaten three transmissions...does that count?

07-31-2014, 05:47 PM	#1042
Leafy Scooby Specialist Member#: 330625 Join Date: Aug 2012 Chapter/Region: NESIC Location: MA Vehicle: 2006 WRX WRB	The easy way to fix the gearing in 2nd with the 6 speed is to just rev over 8k.

07-31-2014, 06:52 PM	#1043
subydude Scooby Guru Member#: 80649 Join Date: Jan 2005 Chapter/Region: South East Location: Columbia, SC Vehicle: 2000 2.5 Auto-X RSTi Sparkly	No, the generally ends with bad things happening in the engine. The easy way is fitting the right tire, the right transmission, and some special sauce. If I had cubic dollars I'd build a destroker, sleeved back to 2.5 liters and rev to 9.5k. However, that setup would be more than the engine/trans/rear end/diffs/clutch I have now combined.

07-31-2014, 06:56 PM	#1044
Leafy Scooby Specialist Member#: 330625 Join Date: Aug 2012 Chapter/Region: NESIC Location: MA Vehicle: 2006 WRX WRB	Why bore it back out? That displacement doesnt help you much. Stroke is what helps spool bore is just kind of there so you can get a decent shaped combustion chamber and enough valve area. I'd rather have a 2.0 and rev to 8.5 and take the 1/2liter worth of weight of of the car, than have something that spools like a 2.0 and revs like a 2.0, is capable of making a bit more top end than a normal 2.0 but has to weigh as much as a 2.5.

07-31-2014, 06:59 PM	#1045
subydude Scooby Guru Member#: 80649 Join Date: Jan 2005 Chapter/Region: South East Location: Columbia, SC Vehicle: 2000 2.5 Auto-X RSTi Sparkly	You're thinking in inline 4 terms. The 2.0 EJ207 doesn't spool like those, even with small short runners to a small turbo. I had one in my car, and the heads are still in the car right now. While it was great to rev to 8,400 it was a dog out of corners compared to the Evo and 2.5 STi's. The 150 lbs I lose to the 2.0's is more than worth it on the EJ engine for that .5 liters helping with spool. The point is to keep as much displacement as possible for power density, but the destroker for revs.

07-31-2014, 07:03 PM	#1046
Leafy Scooby Specialist Member#: 330625 Join Date: Aug 2012 Chapter/Region: NESIC Location: MA Vehicle: 2006 WRX WRB	But something with the stroke of an ej207 but bored to 2.5 is going to spool basically like a ej207. Bore doesnt have a very noticeable effect on spool.

07-31-2014, 07:05 PM	#1047
subydude Scooby Guru Member#: 80649 Join Date: Jan 2005 Chapter/Region: South East Location: Columbia, SC Vehicle: 2000 2.5 Auto-X RSTi Sparkly	Hmm, it seems odd to me that increasing the volume of exhaust doesn't affect spool. I'd need to read more on the subject. Needless to say, I'm not building one because I don't have cubic dollars. I'll stick with my standard EJ257 for now.

07-31-2014, 07:08 PM	#1048
Leafy Scooby Specialist Member#: 330625 Join Date: Aug 2012 Chapter/Region: NESIC Location: MA Vehicle: 2006 WRX WRB	I'm still surprised that an EJ207 with a vvt head, efr 6758 and a low mount manifold cant be spooled by 4k rpms. A power band from 4k to 8.5k should be wide enough.

07-31-2014, 11:54 PM	#1050
Leafy Scooby Specialist Member#: 330625 Join Date: Aug 2012 Chapter/Region: NESIC Location: MA Vehicle: 2006 WRX WRB	If 4k is too high for the start of the power band then your ** just doesnt handle well enough. A 5500rpm wide powerband on an auto-x car would get you power from 35mph to 72mph. If there's any turn that your car cant take on a national level course above 35mph then it handles worse than most top level stock class cars. And **, with the 07+ sti gears and 315's on 18s or 17s you're actually closer to 75mph at 8.5k in 2nd and thats more than enough speed for anything making under 500whp at an auto-x.