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Old 09-12-2006, 06:34 AM   #1
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How much boost is limited in 1st and 2nd?

Last night my ex came by to use my garage to change her GTI 1.8T's oil and rotate tires. Yeah she does it herself, I just offered tips So anyway, it was making a weird noise so I took it out for a spin.

I forgot how wild and almost uncontrollable that car is down low! The clutch was stupid light compared to the Viggen and that didn't help any. But you get full boost in all gears, so if you don't go gently on it it'll go crazy.

Which makes me ask, just how much power is limited in first and second on a Viggen? I know I would walk her car silly, but wow that low gear boost is nuts. I know I could adjust that with an MBC and I may do that someday.
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Old 09-12-2006, 06:41 AM   #2
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Well unfortunatly on the Vig no MBC to adjust it but you could use the old SMBC for it.

I know that on my 9-3 SE HOT I get in the area of 7.5-8.5 in 1st and 2nd on the Automagic and with the SMBC I average 9.5-10.5 in 1st and 2nd.
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Old 09-12-2006, 07:07 AM   #3
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Same for me in my 9-3 when I had the SMBC on.


NOthing crazy or anything, just a bit more "peppy"
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Old 09-12-2006, 08:11 AM   #4
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Stock I was limited to about 7psi in first. For half of the gear its like you have no boost, then toward the middle say 3k 5psi went to 7psi and I had some wheel spin. In 2nd I would see 10psi.

After software 1st gear does not exist under boost, by the time you look at the gauge to see how much boost your tires are already protesting and its time to shift. My guess is its about 10psi, and much sooner. 2nd gear is about 15psi, and once again tires light up all the way to redline and 60+mph before shifting into 3rd.

If you got the FULL amount of boost available in the lower gears, say 18-20 psi it would be pointless.
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Old 09-12-2006, 08:58 AM   #5
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Oh I actually don't want full boost in the lower gears. Driving her car made me realize the boost limiter is a good thing. I was actually just curious how little boost there is in those gears. I would like more power in 2nd, it just feels so anemic and gutless and I don't think it needs to be limited so much.

So with software some of that low gear limit goes away?
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Old 09-12-2006, 09:03 AM   #6
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On a stick shift you will lose almost all of the limits in 1st and 2nd and in an Automagic you will be limited by torque rather than peak PSI for the most part.
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Old 09-12-2006, 10:00 AM   #7
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Quote:
Originally Posted by Voodoo View Post
Oh I actually don't want full boost in the lower gears. Driving her car made me realize the boost limiter is a good thing. I was actually just curious how little boost there is in those gears. I would like more power in 2nd, it just feels so anemic and gutless and I don't think it needs to be limited so much.

So with software some of that low gear limit goes away?
first went from 7-10, 2nd went from 10-15, so 2nd makes 95% of the boost that 3rd does now. You will love 2nd gear with stage 3.
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Old 09-12-2006, 10:06 AM   #8
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ive noticed that 1st gear actually makes like 13psi...maybe thats what led to the destruction of a gearbox....

and 2nd is 15psi, 3rd is psi, 4th is 15-16, and 5th is right around 15.

all are +/- 1psi or so...i havent seen it at like 0 degrees yet, so i cant comment on the variation of boost because of t7


and jameson is right, i would say that 2nd gear is my favorite gear in my stage 4 9-5....its a very nice blend between wheelspin, acceleration and torque steer. and the looks from people around town when i boost it in 2nd gear are pretty weird. they think something is broken and about to blow up
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Old 09-12-2006, 10:13 AM   #9
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ive noticed that 1st gear actually makes like 13psi...maybe thats what led to the destruction of a gearbox....

and 2nd is 15psi, 3rd is psi, 4th is 15-16, and 5th is right around 15.

all are +/- 1psi or so...i havent seen it at like 0 degrees yet, so i cant comment on the variation of boost because of t7


and jameson is right, i would say that 2nd gear is my favorite gear in my stage 4 9-5....its a very nice blend between wheelspin, acceleration and torque steer. and the looks from people around town when i boost it in 2nd gear are pretty weird. they think something is broken and about to blow up
I agree 100% and my boost numbers are pretty much identical, but have gone down maybe 1lb-1.5lbs since the intercooler, but will likely return after the retune for stage 3+. I too love 2nd gear especially with the smoother revs and steady top end pull after the intercooler.

I dont know if I get 13psi in 1st, I doubt it since I feel the 9-5 would better handle extra 3psi and better move the extra 400lbs off the line. 10 in first is plenty for a Viggen.
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Old 09-13-2006, 05:33 AM   #10
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i cant keep 13psi planted though. i have gotten on it hard in 1st and just absolutely hit the rev limiter, cause the rocket engines light up the tires so friggen fast.

but thats why i dont accelerate hard in 1st anymore....now that the front tires are shot, i get wheelspin almost all the way through second.
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Old 09-13-2006, 09:05 AM   #11
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i cant keep 13psi planted though. i have gotten on it hard in 1st and just absolutely hit the rev limiter, cause the rocket engines light up the tires so friggen fast.

but thats why i dont accelerate hard in 1st anymore....now that the front tires are shot, i get wheelspin almost all the way through second.
First gear is a joke for me. If I give it the lightest tip in, where it reads 0 Vac, no boost the tires chirp. If I give it enougth gas to build boost its wheel spin and a thrash to shift before hitting the limiter.

When I first put in stage 3, as evidence by the video, 2nd gear at 15psi would spin the tires through the whole gear, 28mph to redline at 60mph. It doesnt do it as much now, I am hoping not because I am down on power but due to my new tires are a bit broken in.

I use first gear 99% of the time to just get me rolling.
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Old 09-13-2006, 07:12 PM   #12
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get good rubber


my azenis model 215s are perfect for the viggen and i paid $300

turn in is much better(due to such a stiff sidewall) and wheelspin is virtually eliminated except at turn exit(due to no LSD) and its only the inside tire, but that cant really be eliminated unless you go Rcomp.
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Old 09-13-2006, 07:51 PM   #13
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get good rubber


my azenis model 215s are perfect for the viggen and i paid $300

turn in is much better(due to such a stiff sidewall) and wheelspin is virtually eliminated except at turn exit(due to no LSD) and its only the inside tire, but that cant really be eliminated unless you go Rcomp.
Talk to me at stage 3ish with another 50hp. My tires were more than adequate before the software. I am looking at the Azenis 615's.
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Old 09-13-2006, 08:01 PM   #14
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Talk to me at stage 3ish with another 50hp. My tires were more than adequate before the software. I am looking at the Azenis 615's.
615s are decent, i ran them on a mazda3S i raced, they were pretty nice, but not as good(in my opinion) as the 215s are.


and i wont be going stage3 anytime soon.
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Old 09-13-2006, 08:10 PM   #15
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615s are decent, i ran them on a mazda3S i raced, they were pretty nice, but not as good(in my opinion) as the 215s are.


and i wont be going stage3 anytime soon.
I havent heard anything bad about the 615's. I was told they are the stickiest street tire, non R compound you can buy.
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Old 09-20-2006, 04:42 PM   #16
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pretty much, I use them to Road Race and used to use them to AutoX with (got Victoracers instead HEH).
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