how to speed up my pure stock 305 Camaro
 

I have a 1991 Camaro Rs 305ci with throttle body injection. I have installed a torque converter and removed a/c and smog pump and have drag radials. I want to be able to drive this car to the track and race it. Any suggestions I can do besides the obvious? - spending tons of $

Re: how to speed up my pure stock 305 Camaro
 

Colder thermostat, lower temp fan switch, and a computer chip!

Re: how to speed up my pure stock 305 Camaro
 

What do you have for headers ?

Re: how to speed up my pure stock 305 Camaro
 

I haven't invested in headers yet. Still have the manifolds on with catback exhaust 21/4 pipes.

Re: how to speed up my pure stock 305 Camaro
 

Running 4 quarts of low weight syn. oil will gain a tenth. Running 4 quarts shouldn't be a problem if you keep close check and don't let it get any lower. Remove as much weight as possible, low weight wheels, tires, spare, jack, etc.

Re: how to speed up my pure stock 305 Camaro
 

what rear gears do have in the car?

Re: how to speed up my pure stock 305 Camaro
 

I put a 3.42 rear gear and a posi unit

Re: how to speed up my pure stock 305 Camaro
 

Add 4.10's

Re: how to speed up my pure stock 305 Camaro
 

I would go with at least a 4:10 or 4:30. With the OD trans, those gears would be fine unless you plans to drive long distances on the street. your 3:42 is not nearly enough gear for the strip.

Re: how to speed up my pure stock 305 Camaro
 

On my 95 Impala SS
It uses a 4.10 with 26 inch tall tires for racing.
Change to near 28 inch tall street tires to drive home on.
With the 4L60E tranny get near 20 mpg cruising home.

If you Trailer 4.56 with 28 inch tall slick works.


D

Re: how to speed up my pure stock 305 Camaro
 

^^ Good suggestions so far.

-160 deg. thermostat
- as deep of a rear gear as resonable to cruise on the road with
- minimum weight to fit class
- lots of air pressure in the front tires
- short belt to bypass the power steering (or remove PS altogether)
- aftermarket headers and an x pipe (must run mufflers that are not "see through"

Re: how to speed up my pure stock 305 Camaro
 

What e.t.'s are you running now? What horsepower is your motor?

Re: how to speed up my pure stock 305 Camaro
 

Don't think it needs a chip? Many of those have a delay before the ECM goes into Power Enrichment. That is like your Holley power valve not opening for a few seconds.
You can not band aid around that. Also timing it foot braking from a low RPM. Turn the distributor far enough to make them leave like that, and it's over-advanced at higher RPM. You have to change the curve.
Just the washer part of a thermostat would be better than a 160. Do you race your car at 160? Probably not if it has an iron block.

Re: how to speed up my pure stock 305 Camaro
 

Headers are on the way. Ordered some headman headers and got some flowmasters to go on it.

Re: how to speed up my pure stock 305 Camaro
 

The car has run a best of 9.72. But other than that one time it runs 9.85s. and it is a 170HP 305

Re: how to speed up my pure stock 305 Camaro
 

160 in the burnout box.
170 when the car is fully staged.
180 at the end of the run.
all on 93 Unleaded

Re: how to speed up my pure stock 305 Camaro
 

if you want to get a little deeper you can gain a lot of cam,of course it has to match specs for duration, overlap, and lift. cc heads you'll probaly find they need .030-.060 milled to get down to min. cc. match valve springs to press specs you'll probaly have to get specs from IHRA to come up with duration,overlap, and spring pressure.
With a pure stocker cam probaly need 4000-4500 or so on converter but w/lock up could cruise like stock converter.
4.56 is lowest you can get for 7.5 but w/ od I think is .77 which would make 3.51 final,take 4.56 and mutiply by .?? (od ratio) will give you actual ratio in OD.
Don't spend much on 7.5 when can go ahead and go 12 bolt.I spit 7.5's w/ auto out of my pure stocker when first built it
Mike Taylor 3601

Re: how to speed up my pure stock 305 Camaro
 

Why? Might try running it a little cooler. May find a little ET. Mine likes to leave about 90 degrees.

Re: how to speed up my pure stock 305 Camaro
 

For Mufflers..I like Spintech the best ..

Enjoy that my ears are not ringing at the end of the day.!

BTW my car still has working AC and love cooling down a bit after a run :D

D

Re: how to speed up my pure stock 305 Camaro
 

Ed:
Are you running racing fuel ?

I might experiment with the lower temps. Not sure how it will work with a 9 to 1 engine on unleaded pump gas.
Alot of the reason I run at those temps are for round robin (consistency) purposes. Easier to get the water temp down to 160 than it is 90 degrees between rounds.

I'm still using the OEM computer and sensors even tho the IHRA rulebook does not say a racer cannot run an aftermarket ECM. ( if I read that correctly)
All I did on my car was set the dizzy and leave out the spout connector so the timing is locked @ 32 deg.

Re: how to speed up my pure stock 305 Camaro
 

So true.
"The dreaded blowmaster drone..." lol

Re: how to speed up my pure stock 305 Camaro
 

When I was still driving mine on the street on pump gas, it was still quicker cooled down.
That GM car has a plug-in chip. Uses the stock ECM. I can/have made stock looking chips for limited classes that don't allow chips. LOL

Re: how to speed up my pure stock 305 Camaro
 

the tbi engine such as 305 can run with the timing connector unplugged to run at a base timing too. unlpug it and set the timing to 32-34 at the track, set back to 0-4 and plug in for the drive home

Re: how to speed up my pure stock 305 Camaro
 

do those cars have an adjustable fuel pressure regulator on them?

Re: how to speed up my pure stock 305 Camaro
 

You can, but it then runs in "Backup Fuel Mode". I don't know what the WOT air/fuel ratio would be then.

"Do they have adjustable fuel pressure regulators?"

No, but they can be made adjustable.

Sure crude-azzed ways to try to tune one. Lmao!

Re: how to speed up my pure stock 305 Camaro
 

Got headers and mufflers on yesterday and going to change oil to synthetic. Hopefully this will pick me up some.

Re: how to speed up my pure stock 305 Camaro
 

my 88 monte ss is retired from pure stock but still will run 8.7s all day let me know how your coming out. that tbi motor runs way lean to begin with(hope you got a better fpr). I put one on my 87 suburban and it ran a lot better 3800lbs 10.30 1/8 mile and 20 mpg with 3.08's.