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Old 05-11-2004, 01:52 PM   #1
FSelekler
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Default ECU Modifications in Street Prepared?

I have been looking through the rules for Street Prepared class and could not find something that would give me a clearer idea on ECU reprogramming.

Unless I somehow missed it, I should then asssume that it is not allowed I guess. However, in STS/X rules, it clearly says that it is allowed within certain limitations, so.... some hope may be ?

Thank you for any clarification in advance.
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Old 05-11-2004, 02:08 PM   #2
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You can change timing and fuel but you can't touch boost control.
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Old 05-11-2004, 02:18 PM   #3
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The Cobb AcessPORT comes with an STX map just for this!
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Old 05-11-2004, 02:26 PM   #4
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Quote:
Originally posted by ElGranBanò
The Cobb AcessPORT comes with an STX map just for this!
that may or may not be legal
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Old 05-11-2004, 02:32 PM   #5
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Quote:
Originally posted by TyrannoSullyRex
that may or may not be legal
That is my fear We have AccessPort on the way, but I am not sure we will be able to use it. And we cannot use a Turboback without porting the wastegate and that is not allowed either.

So, we may be stuck with cat-back
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Old 05-11-2004, 02:33 PM   #6
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You can make pretty extensive ECU changes in Street Prepared. Some of the factory parts must be retained for legality (I can't remember as its been over a year since I read those rules). I ran a Tec3 Electromotive ECU in my DSP integra but had to retain the stock VTEC engagement ( which would be similar to retaining your stock boost levels in a WRX ).

Quote:
D.

Alternate computer control modules may be used whenever an equivalent change to the conventional system is allowed. For example, alternate computer module control of ignition settings or fuel injection is allowed. Direct turbocharger boost control by alternate computer control is not, since there is no equivalent mechanical allowance.
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Old 05-11-2004, 02:53 PM   #7
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Quote:
Originally posted by FSelekler
That is my fear We have AccessPort on the way, but I am not sure we will be able to use it. And we cannot use a Turboback without porting the wastegate and that is not allowed either.

So, we may be stuck with cat-back
You might be able to install a fuel-cut defender in SP where it is not legal in say STX. I know guys that ran DSMs in ESP a few years ago would run catless exhausts and find ways to make the boost spike via means other than boost control. Spike = more power
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Old 05-11-2004, 02:55 PM   #8
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Should I take it that "boost control" is different than running a "higher boost pressure", or am I stretching things a little here ?

Thank you for the enlightment all.
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Old 05-11-2004, 03:10 PM   #9
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Quote:
Originally posted by FSelekler
Should I take it that "boost control" is different than running a "higher boost pressure", or am I stretching things a little here ?

Thank you for the enlightment all.
You can't touch stock boost maps, wastegate settings, bleed valves or anything that directly controls boost. Any legal changes (exhaust, intake, intercooler) that happen to increase boost are legal.

The bottom line is you can make some changes that will result in legal boost spikes. However, you'd better have a REAL good explanation for anything that causes your car to consistently generate higher than stock boost levels.

-Steve
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Old 05-11-2004, 03:13 PM   #10
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I understand thank you very much.
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Old 05-11-2004, 03:53 PM   #11
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Quote:
Originally posted by FSelekler
That is my fear We have AccessPort on the way, but I am not sure we will be able to use it. And we cannot use a Turboback without porting the wastegate and that is not allowed either.

So, we may be stuck with cat-back
You can run a turbo back without porting the wastegate for autox, you are not going to hit boost cut untill you get out of 3rd gear. It just means no highway runs on the way home.

Oh and FCD's have been illegal for awhile.
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Old 05-11-2004, 04:31 PM   #12
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Quote:
Originally posted by afpdl
You can run a turbo back without porting the wastegate for autox, you are not going to hit boost cut untill you get out of 3rd gear. It just means no highway runs on the way home.

Oh and FCD's have been illegal for awhile.
Yes of course

The issue is that we do quite a bit of track testing as well, and I don't want to be installin/uninstalling a TBE from event to event

Thank you for the reply however.
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Old 05-11-2004, 05:14 PM   #13
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What't the issue with the TBE?

Is it that you get too much boost creep, or is it that you worry about the boost taking you over stock levels.

If it's caused by the bellmouth downpipe you could always use a HKS downpipe that has the stock style wastegate flange.
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Old 05-11-2004, 05:23 PM   #14
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Boost Creep is the worry.

And we need to use the Cobb one when it comes out.
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Old 05-11-2004, 05:27 PM   #15
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None of the TurboXS turboback exhausts have boost creep issues to my knowledge due to the tapering down at the end of the intermediate pipe.
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Old 05-11-2004, 06:53 PM   #16
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If you keep the stock muffler on except for events it may be enough to keep the creep down. With an HKS downpipe and stock cat back I dont have creep issues unless its cold and Im at the top half of 5th gear.

Getting the cobb downpipe with a cat may also be enough to keep boost cut from occuring.
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Old 05-11-2004, 11:46 PM   #17
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Quote:
Originally posted by afpdl
Getting the cobb downpipe with a cat may also be enough to keep boost cut from occuring.
I certainly do hope so We'll see when it comes out. Also, without proper ECU modifications, would a TBE still help in power delivery? We are not necessarily looking at a peek hp/trq increase, but a broader delivery across the RPM range; and oh-boy, would it be nice if we could somehow get 4-500 more RPM with AccessPort, We have been riding the rev-limiter for some time now
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Old 05-11-2004, 11:48 PM   #18
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You get more top end and low end with the downpipe. When I went to an hks downpipe I stopped feeling that drastic drop in power over 6k rpms that I felt when it was stock. The power still tapers but not nearly as much.
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Old 05-12-2004, 12:23 AM   #19
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:thumbup:
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Old 05-12-2004, 10:05 AM   #20
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This kind of silliness is exactly why I bypassed STU and went straight from AS to SM!!

Can't play w/ boost on a turbo car? Phooey! What fun is that?

Russ R
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Old 05-12-2004, 12:12 PM   #21
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Quote:
Originally posted by wrrrx
This kind of silliness is exactly why I bypassed STU and went straight from AS to SM!!

Can't play w/ boost on a turbo car? Phooey! What fun is that?

Russ R
I certainly can relate to it, but we have to stay in Street Prepared, and no doubt it is slightly more cost-effective.
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Old 05-13-2004, 10:35 AM   #22
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Quote:
Originally posted by FSelekler
I certainly can relate to it, but we have to stay in Street Prepared, and no doubt it is slightly more cost-effective.
Yep! esides, who says a STX/SP car can't be fun to drive around town?
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Old 05-13-2004, 10:51 AM   #23
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Quote:
Yep! esides, who says a STX/SP car can't be fun to drive around town?
Yeah, but it would also be cool to drive "12-sec" sleeper around town too.
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Old 05-13-2004, 11:20 AM   #24
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Have you looked into twin dump style downpipes? I'm running a BPM unit and have not seem the boost creep issues your talking about. I'm runningnthe stock ECU with stock boost controll for STX and have had good luck with the power deliver. If only I could get the car pointed in the right direction faster
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Old 05-13-2004, 11:24 AM   #25
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Miranda (Midnight_Gold) is running the stromung divorced wastegate 3" (sweet looking setup btw) with a 3" midpipe and high flow cat into a 2.5" straight pipe w/o a muffler and is not getting any boostcreep.

-Tom
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