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Old 07-17-2002, 08:36 PM   #1
Onederer
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Default anyone with TXS stg.4 w/ VF34?

I just re-installed my unichip with stage 4 mapping. To go along with what amounts to a stage 4 but with a VF34, rather than the vf30.

After taking my car out for a test drive, I noticed a bit (lot) of detonation when boost hits above 15 psi at between 4k and 6+k rpm. I f anyone else out there has the same set up, did you have the same problem, and did it go away once the computer gets everything figured out?

I don't currently have the funds to get a dyno tune, so if this situation is not going to self cure, I may have a unichip for sale soon.

Thanks for any answers you can provide.

Carlos
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Old 07-17-2002, 09:23 PM   #2
Wombat North
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I will be installing the vf34 with stage 4 as soon as the vf34 arrives in 2 weeks. I will post results then.

I have also heard of only 1 person who had detonation with the vf30 and lots that are very very happy with stage 4 with vf30 and no detonation.

Give turboxs a call, I'm sure they can help you out.

I would like to know what they say as I certainly don't want your problem when I install my vf34.
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Old 07-17-2002, 10:58 PM   #3
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Quote:
Originally posted by Wombat North
I will be installing the vf34 with stage 4 as soon as the vf34 arrives in 2 weeks. I will post results then.

I have also heard of only 1 person who had detonation with the vf30 and lots that are very very happy with stage 4 with vf30 and no detonation.

Give turboxs a call, I'm sure they can help you out.

I would like to know what they say as I certainly don't want your problem when I install my vf34.
What do you Stage 4 guys think of the new TXS TMIC? It certainly improves Stage 2 and should do better when the Stage 3 map is available. The expectation for Stage 3 is 340 - 350 HP with the stock turbo.
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Old 07-17-2002, 11:04 PM   #4
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What boost gauge are you reading off? Did you adjust the boost after the instal? My boost gauge is a autometer it is reading 2lbs low just a thought.
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Old 07-18-2002, 01:51 AM   #5
Wombat North
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Could be
poor fuel-up the octane
wrong map-mistake in programming, ie you got the fp map by mistake.

FWIW
There is another post from Turboxs that I can't find that says because the vf34 spools faster than the vf30 they may have to adjust the stage 4 map.

good luck
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Old 07-18-2002, 03:51 AM   #6
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TurboXs told me that the map for the VF34 and VF30 are the same. After I installed the turbo, I babied it for a couple hundred miles before I got on it( I don't know if it helped w/ break in or not. But it couldn't hurt.) I have it running 18.5 lbs of boost, and no knock/ping. I have a knock link, and all I get is the first 2 green LED's at higher RPM's. I also use 93 octane, have an HKS boost gage, and Greddy EGT gage. Everything is OK on my car. Maybe bad gas? Try a new tank. If it still does it then call TurboXS.
z&cobb - The thing I don't like about the TMIC is that it will still suffer from heat soak. I'm going to go with a FMIC. It's just my preferance. But that TurboXS TMIC is HUGE! But that will be after a clutch and flywheel.
EDIT: I just thought of this: Have you installed colder spark plugs yet?
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Old 07-18-2002, 03:55 AM   #7
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Thanks guys, maybe this Cali Psuedo gas is to blame. I'm going to try Padre's route, and stay mellow. I took it out again, and it does seem to have lessened (sp) a bit with a few miles and a different brand of fuel.(union 76 as opposed to Cheveron)

I'll keep you updated.

Hey Padre, maybe next time I'm back home in El Paso, we can head to the track? Whatta ya say?


Carlos
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Old 07-18-2002, 08:32 AM   #8
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Quote:
Originally posted by Onederer
Thanks guys, maybe this Cali Psuedo gas is to blame. I'm going to try Padre's route, and stay mellow. I took it out again, and it does seem to have lessened (sp) a bit with a few miles and a different brand of fuel.(union 76 as opposed to Cheveron)

I'll keep you updated.

Hey Padre, maybe next time I'm back home in El Paso, we can head to the track? Whatta ya say?


Carlos
Carlos,
Call us! If your getting detonation with your chip please DONT drive it. I'd like to have another look at your chip, because from everything we have seen thus far the maps for the 2 are really no different.

-Nathan
www.turboXS.com
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Old 07-18-2002, 09:39 PM   #9
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Thanks for the reply Nathan.

I sent the unit back, just to be safe. Something could have happened in transit to me. So better safe than sorry. I'll keep everyone updated.
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Old 07-19-2002, 08:02 PM   #10
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What would alot of detonation feel like?

I just had VF34 installed and as I was taking it out for a drive, everytime I go WOT, around 4.5k, the car slows down dramatically and exhaust tone changes to muffled backfiring noise. From that point, the car crawls. If I don't go WOT, it slowly accelerates but goes up without any hickups.

I have turboback, uppipe, Sti injectors, CAI, and Samco IC hoses WITHOUT Unichip because it's getting reprogrammed. So stock ECU is controlling everything.
Is there a way to fix this problem?
Thanks.

Doug

Last edited by Dougeefresh; 07-19-2002 at 08:47 PM.
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Old 07-19-2002, 08:17 PM   #11
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Not an expert but I saw a post which says that if you use sti injectors with the stock ecu only you would be running pig rich.
http://forums.nasioc.com/forums/show...hreadid=217091
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Old 07-19-2002, 08:37 PM   #12
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It won't be possible until Sept., maybe late August, but I *will* have a Stage 4 e/w a VF34 ... tuned! I am re-e-eally looking forward to it as I am totally stock now ... except for an ITG filter. I believe that some pretty good dyno charts will be available so you can make an intelligent decision as to whether the VF34 will be worth it. I decided the heck with it ... it should spool earlier, I will take what I can get.
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Old 07-19-2002, 09:11 PM   #13
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I have stage 4 with vf34 and now... TXS top mount (BIG farkin I/C)!!

I've never had any problems when using similar parts to are what in the TXS kits. I built my own stage 4... but DID use their unichip and turbo-back. The rest of the parts are different.

Only det I've gotten was when trying a few other intakes which the TXS guys warned me of ahead of time anyhow.

All seems great with the I/C, but at the advise of the TXS guys again, I reduced the boost a lil while they get more dyno results and all that.

Erik
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Old 07-19-2002, 09:47 PM   #14
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Doug, I have not had the problems that you are experiancing. While running with out my unichip. And I have pretty much your exact set up. What is your boost presure when it start to hiccup?

Si2WRX
I don't have anysort of CAI, so that couldn't be it. Hopefully when the chip gets back to me things will be fugured out.
What did you dial your boost back to?
I've had mine at 17psi with the chip in, then went to 15 and it still did it ,just a little less so.
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Old 07-19-2002, 09:51 PM   #15
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About 16.5 ish
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Old 07-19-2002, 09:55 PM   #16
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Quote:
Originally posted by Dougeefresh
What would alot of detonation feel like?

I just had VF34 installed and as I was taking it out for a drive, everytime I go WOT, around 4.5k, the car slows down dramatically and exhaust tone changes to muffled backfiring noise. From that point, the car crawls. If I don't go WOT, it slowly accelerates but goes up without any hickups.

I have turboback, uppipe, Sti injectors, CAI, and Samco IC hoses WITHOUT Unichip because it's getting reprogrammed. So stock ECU is controlling everything.
Is there a way to fix this problem?
Thanks.

Doug
Doug,
Welcome to the club!!!! I yanked my unichip and the symptoms you are having are "normal". The only addition I have to you is an MRT FMIC. Mine just started doing the same thing yesteday (after I installed the injectors). I've spoken with a couple people who have been in our position and believe it or not, it will clear up (sounds like we're talking about the "clap" ). It just takes a "few" miles for the ECU to adjust. I started a thread entitled "Sti injectors with stock ECU" if you haven't seen it. Did you at least get to drive the 34 on the stock injectors? Serious grin factor

Ryan
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Old 07-20-2002, 02:34 AM   #17
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Quote:
Originally posted by Onederer
Doug, I have not had the problems that you are experiancing. While running with out my unichip. And I have pretty much your exact set up. What is your boost presure when it start to hiccup?
I hit full boost (now around 14) before 4K and it pull not so strong until around 4.6~4.7K then the hesitation occurs. It seems to be most obvious in 2nd.

Doug
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Old 07-20-2002, 02:37 AM   #18
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Quote:
Originally posted by Ryan23


Doug,
Welcome to the club!!!! I yanked my unichip and the symptoms you are having are "normal". The only addition I have to you is an MRT FMIC. Mine just started doing the same thing yesteday (after I installed the injectors). I've spoken with a couple people who have been in our position and believe it or not, it will clear up (sounds like we're talking about the "clap" ). It just takes a "few" miles for the ECU to adjust. I started a thread entitled "Sti injectors with stock ECU" if you haven't seen it. Did you at least get to drive the 34 on the stock injectors? Serious grin factor

Ryan
I did turbo and injectors at the same time. I logged about 40 miles today and it didn't seem to improve yet.
We'll see how it goes...
I was expecting that 'Serious grin factor ' but unfortunately didn't get it.
Hopefully, it's on its way here soon
Thanks.

Doug
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