Chipped ECU Rev Limiter

[Tek4ever]

I bought the GIAC file and noticed that my rev limit is around 7200 RPM. Anyone else here have GIAC? Please let me know what your rev limit is at. I just read that REVO and APR rev limiter was raised to 7500 RPM and concerned...


Thanks

[Audi05s4]

mine is about that maybe around 7300 rpm

[b00st]

can't find any info as to their rev limiter. i would call giac and ask. either that or call awe-tuning.

[Cargo8]

7200 is stock

[b00st]

stock is 7000rpms. i checked it out myself.

[Cargo8]

stock on a b7 is 7200 from experience. different for b6/b7?

[Tek4ever]

b00st...thanks for looking and all of ur input. You, zona & me sould get together...even to do more tests if you want. Shoot me a PM, let me know when ur schedule permits.

[bhvrdr]

stock on a b7 is 7200 from experience. different for b6/b7?

Correct, 7200rpm is where the limiter is for the B6 and B7 S4. APR and Revo will move this to just about 7600rpm.

cheers! mike

[b00st]

b00st...thanks for looking and all of ur input. You, zona & me sould get together...even to do more tests if you want. Shoot me a PM, let me know when ur schedule permits.

sure, whenever. well weekends are better...i'm busy with the office during the week and my little one (6 months old now) has been keeping us on our toes. 2hrs of sleep, makes my weekdays hard. between him and the office.
i'm up for some more weekend testing.

and REVO rev limiter is at 7500 per REVO/RENN-ART/ZONA

and i could swear my dash says 7000 when it hits it. i've done it a few times.

don't know APR because i've never used their software on my A4 or S4. just GIAC or REVO.


funny thing is...i can't seem to be able to pass the redline that is says at 7000. check out that gas mileage.

[b00st]

taken from automobile magazine. it appears the redline for them was 7000 too. and i know it is for me...i watched it bang off of it.

Power is delivered early in the 4.2s powerband, staying solid as the tachometer flings itself toward the 7,000 rpm red line -

[b spot]

Definitely 7200 stock and 7500+ for APR (Can't speak to the other flashes)

[bakos4]

GIAC doesn't remove the rev limiter it only removes the top speed gov.

[bhvrdr]

taken from automobile magazine. it appears the redline for them was 7000 too. and i know it is for me...i watched it bang off of it.

Power is delivered early in the 4.2s powerband, staying solid as the tachometer flings itself toward the 7,000 rpm red line -

Some magazines report on where the redline is indicated on the dash. The way to see where the rev limiter is on these cars is to run a data log througout the rev range and literally watch were it stops. It is right around 7200rpm (its actually a slightly odd number like 7180rpm or 7220rpm or the like) and the APR and Revo is around 7580rpm or something when I logged it. I'll have to go check my logs when I get home. You really cant go off of tachometers though. They may not even be that accurate to the 100rpm.

[b00st]

Some magazines report on where the redline is indicated on the dash. The way to see where the rev limiter is on these cars is to run a data log througout the rev range and literally watch were it stops. It is right around 7200rpm (its actually a slightly odd number like 7180rpm or 7220rpm or the like) and the APR and Revo is around 7580rpm or something when I logged it. I'll have to go check my logs when I get home. You really cant go off of tachometers though. They may not even be that accurate to the 100rpm.

true enough.

[Tek4ever]

I hate when companies make it difficult to find their contact number...or not even have one. I finally received a response from GIAC and the response was:

We actually left the rev limiter at 7200 as the cars have seemed to have valve issues even when stock. We did not want to accelerate the wear on the cars. We actually found that we could make peak power before that point. Raising the rev limiter to 7500 is possible to do but we would likely require a waiver to be signed due to the hardware not being able to safely accommodate it.

I wish I knew that before. Not that it makes a huge difference but I would think the extra 300/400 RPM would help. I sent an e-mail asking how would I even know if the installer really gave me the GIAC file? I never received anything from them in the mail for warranty or anything...

[bhvrdr]

I hate when companies make it difficult to find their contact number...or not even have one. I finally received a response from GIAC and the response was:

We actually left the rev limiter at 7200 as the cars have seemed to have valve issues even when stock. We did not want to accelerate the wear on the cars. We actually found that we could make peak power before that point. Raising the rev limiter to 7500 is possible to do but we would likely require a waiver to be signed due to the hardware not being able to safely accommodate it.

I wish I knew that before. Not that it makes a huge difference but I would think the extra 300/400 RPM would help. I sent an e-mail asking how would I even know if the installer really gave me the GIAC file? I never received anything from them in the mail for warranty or anything...

Yeah, GIAC will not list a phone number on their website. They prefer customers go through their distributors which I dont like since we all know some "dealers" of tuner products can vary in knowledge and service greatly. Oh, well. Not the biggest deal in the world.

FWIW, if concerned about the rev limiter all I can say is I have 85K miles on my car, several track days running down the back straits at 7500rpm for a long time, 20 to 40 dyno runs to 7600rpm, and probably 100 to 200 datalog runs to 7600rpm (not to mention daily driving to the limiter so I can hear the wonderful exhaust note) and not a problem here. Your results may vary but just thought i'd share.

cheers! mike

[Meradin]

That's an interesting response. I wonder what the validity of their statements is about the valves and what actual issue there is? I know from experience that the OCT software raises the limiter to 7500 and would like to know if I might be damaging my engine when I take it up into that range.

[bhvrdr]

That's an interesting response. I wonder what the validity of their statements is about the valves and what actual issue there is? I know from experience that the OCT software raises the limiter to 7500 and would like to know if I might be damaging my engine when I take it up into that range.

Have you seen any posts of O.CT, APR, Revo, MTM, etc cars running around with blown motors? I'd probably sleep easy. Any motor can have some rare issues. I've heard of a few very rare S4 engine failures and they were on stock cars (probably bc 99% of v8 S4 cars are stock ECU). I imagine there's the same failure rate on modded ECU cars which is very few and likely why we havent heard of a single one yet.

[Tek4ever]

I have 85K miles on my car, several track days running down the back straits at 7500rpm for a long time, 20 to 40 dyno runs to 7600rpm, and probably 100 to 200 datalog runs to 7600rpm (not to mention daily driving to the limiter so I can hear the wonderful exhaust note) and not a problem here. Your results may vary but just thought i'd share.

cheers! mike

Thats awesome to know - thanks for sharing!

Also, please update my recorded time Saturday. I hope to perform better with lighter wheels :) I'll post my time slip Friday night

[bhvrdr]

Thats awesome to know - thanks for sharing!

Also, please update my recorded time Saturday. I hope to perform better with lighter wheels :) I'll post my time slip Friday night

right on bud. good luck with it out there!!!