ihave a 1989 gta ijust got my gtech meter the other day since then i have used it a couple of times and i am very dissapointed i just dont get it i ran 15.7@92.5mph and a 0-60@7.6 my car is a 350tpi ported upper intake,bbk afpr,under drive pulleys 2 piece,400hp fuel pump,k&n filter,b&m shift kit,flowmaster muffler,air foil,screens removed from MAF,new plugs,new computer,new MAF,all emissions removed cat hollowed,spare tire romoved for wheight,i did a horsepower check with a guestamated weight of 3675 with myself in the car and it ses 166 rwhp thats terrible,what could be wrong i know i dont have any vacum leaks my fuel presure is set@50lbs. if anyone can help me out here i would appreciate it thank you.

 

how many miles on are on the motor?

 

the car has 114,000 miles but still feels and runs strong.apperently not strong enough though

 

Sounds to me like you have alot of fancy parts, and not a whole lot of an idea of what to Do with them.

You should be Running Low 14's With a Basically stock L98 like that.

Whens the last time you did a tune up, and why Did you increase fuel pressure ?

 

i know cars and its not my first tpi motor im 34 and i have some experience. my 350 formula was running 14s with a new stock engine and minor add ons. i increased the fuel presure for power this is what it supposed to do but maybe its not helping i allready thought about that but i need to cut the screw and put a shorter one in its all the way up and its @50 its hitting the intake.i did a tune up a month ago i did the plugs and fuel filter but i didnt change the wires cap and rotor becuse they looked ok to me.

 

I think ya just kinda made Bort's point. Increasing fuel pressure/delivery to the extent the engine runs rich doesn't help performance...and if you don't have a wide-band O2 sensor or some means of reading the ECM data stream you don't know what the engine wants.

 

welcome to the high 14's low 15's club 350 TPI

I'm in the same boat

but those guys here had a few pointers and are a great help

seems to me you got alof of fency parts, and all this on a stock head/cam motor.... might look good on paper but that's it....(don't mean to flame you by all means)....but I think they have a point here, probably to much fuel....114,000 miles won't help either.

take care of the fuel pressure and see where you stand....I think to much fuel as the same effect as me running my 355 with 24lbers on my 305 chip

 

I agree.

Put the AFPR back to stock setting. Stock setting on timing.

Take a 1/4 mile run or 0-60 mph w/ a G-Tech etc. Now modify ONE THING at a time, checking if you got any gain. Changing more than one thing at a time, it's impossible to judge performance gains.

Tuning is not hard, just time consuming.

 

sounds like crap... that sucks... My 305 TPI is hittin low 15's and maybe 15-14.9 this weekend with a nice cold front on the way... and im stock...with some "upgrades"... and 138,xxx on the motor...u need help bad buddy... deff. take ur pressure down some...and try opening the plenum, runners, intake.... and then u should be able to hit low 14's.. u dont have to touch the heads and cam for that...

 

[QUOTE]Originally posted by ctandc
I agree.

Put the AFPR back to stock setting. Stock setting on timing.

Take a 1/4 mile run or 0-60 mph w/ a G-Tech etc. Now modify ONE THING at a time, checking if you got any gain. Changing more than one thing at a time, it's impossible to judge performance gains.

Tuning is not hard, just time consuming. [/QUOTe


thanks guys i do appreciate your help your probably right i will start with the afpr and go from their.