New Owner 87 GN 1 owner 14K miles

Pronto

Chaos is a ladder.
Dec 9, 2002
11,854
1,077
113
Nashua, NH
They last to low 12s then the usual is a 2-3 flair at 12 flat. You've got time. It's going to take some seat time and tuning before your at that point. Go for a 2800 stall lu converter when it's time to beef up the trans. Don't forget a trans cooler too. Holding boost at the line creates heat. You'll also need some MT drag radials. I'd go with 235s or 255s until you're trapping in the 112 range.
 
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Cobrario

New Member
Aug 28, 2018
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so all my upgrades previously mentioned are in and the car is ok but not quite what I expected, I've set the AWGA to 16psi for now but I'm getting some KR. The part that I'm a little surprised by is the car just won't turn the tires over and is kind dead from a dig, once it spools up it pulls pretty strong but I honestly don't think it's any faster than my wife's Audi Q5, that may be hyperbolic but it def doesn't feel like a 12 sec capable car at this point- I've been told it probably needs a looser converter i.e. 2800-3000.
thanks!
 

berserker6

Assistant to the regional manager
Oct 1, 2009
1,202
41
48
jersey
Turn the boost down til you have no knock. Unless you know it to be false knock always tune for zero. (Read the first 2 sentences again) It's probably a mid 13sec car at this point on pump gas and 16#s. There are adjustments to be made in the chip to lean it out a bit for a better launch and spool BUT proceed with extreme caution. Mistakes are easy and costly to make.
 
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seedling

Well-Known Member
Jun 17, 2012
613
414
63
52
Baton Rouge, LA
so all my upgrades previously mentioned are in and the car is ok but not quite what I expected, I've set the AWGA to 16psi for now but I'm getting some KR. The part that I'm a little surprised by is the car just won't turn the tires over and is kind dead from a dig, once it spools up it pulls pretty strong but I honestly don't think it's any faster than my wife's Audi Q5, that may be hyperbolic but it def doesn't feel like a 12 sec capable car at this point- I've been told it probably needs a looser converter i.e. 2800-3000.
thanks!
Do you have the LT1 or LS1 MAF with Translator upgrade? If not, you’ll need that with your mods.

Did bison recommend a converter to go with your turbo?

Also, what Fuel Pressure Regulator are you running and what is your fuel pressure set on?

And like berserker6 said turn it down until you get a handle on the KR.

My car has very similar mods and my trans (which was awesome until then) had since started flaring. So, I have a new trans sitting on the floor now ready to go in. There are quite a few names out there that can build your trans to handle that horsepower (and much more). So, you might check with Bison, Husek and there are others out there as well depending upon your location.



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zapp240

Active Member
Mar 17, 2016
213
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28
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Pittsburgh, PA
as stated above, turn down the boost until you get the knock retard straightend out. KR will kill that motor faster than a hot knife thru butter. also, make sure you have no vacuum leaks, those 30 year old lines get awfully brittle. baby steps sometimes work better than throwing 10 mods on at a time. makes troubleshooting a little easier.
 

Cobrario

New Member
Aug 28, 2018
21
6
3
48
ya- I should have mentioned I've dialed the boost back and will be installing my MBC so I can fine tune the boost levels better. I need to clear a code we caused when checking for a misfire issue as well then test driving the car for further analysis. Thanks!
 

Cobrario

New Member
Aug 28, 2018
21
6
3
48
Do you have the LT1 or LS1 MAF with Translator upgrade? If not, you’ll need that with your mods.

Did bison recommend a converter to go with your turbo?

Also, what Fuel Pressure Regulator are you running and what is your fuel pressure set on?

And like berserker6 said turn it down until you get a handle on the KR.

My car has very similar mods and my trans (which was awesome until then) had since started flaring. So, I have a new trans sitting on the floor now ready to go in. There are quite a few names out there that can build your trans to handle that horsepower (and much more). So, you might check with Bison, Husek and there are others out there as well depending upon your location.



Sent from my iPhone using Tapatalk
I have a Kirban AFPR set to 43 PSI now _ I've not considered the MAF to this point but I will ask Bison about it- to this point the 2 items next for consideration is the TC and a 3" DP from RJC but I do want to do some more tweaking first.
 

seedling

Well-Known Member
Jun 17, 2012
613
414
63
52
Baton Rouge, LA
I have a Kirban AFPR set to 43 PSI now _ I've not considered the MAF to this point but I will ask Bison about it- to this point the 2 items next for consideration is the TC and a 3" DP from RJC but I do want to do some more tweaking first.
Bison is the man! Can’t speak for others, but, I know that my car ran like “Total Dawg Crap” after I upgraded my fuel system (255 pump, hot wire kit, new Oem style baffled tank, adj fpr, flow matched PTE 65’s and new TT chip made for upgrades). And once I installed the MAF / Translator, it was a new car again. So, check with Bison and see what he says. You can’t wrong following his advice.




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berserker6

Assistant to the regional manager
Oct 1, 2009
1,202
41
48
jersey
Without re-reading the entire thread I'll just ask, do you have the RJC power plate? If not I say its a must. Others may say otherwise but I think at your level of mods its a no brainer, inexpensive and simple to install
 

Cobrario

New Member
Aug 28, 2018
21
6
3
48
Without re-reading the entire thread I'll just ask, do you have the RJC power plate? If not I say its a must. Others may say otherwise but I think at your level of mods its a no brainer, inexpensive and simple to install
I do not have the Power Plate currently, but I'll check it out, thanks!
 

Cobrario

New Member
Aug 28, 2018
21
6
3
48
I've gotten my boost and fuel pressures adjusted properly without any KR at roughly 15/16 psi on the gauge, but now when I launch the car it's flaring on the 1-2 shift. This is a very low mileage car that was kept completely stock by the original owner whose spouse sold it after he passed away. I guess the car could need the trans rebuilt but with only 14k miles I guess I'd be surprised. It's also very likely the trans fluid is stock so would fluid and filter service be worth a try to start with?
 
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