That's the question. I'm trying to get a base for what my planned mods will get me, but I need a base line. SO? What does a stock TBI car run in the 1/4 mile?

 

It really depends. I would say most are about 15.6-17.0. I know its a big difference but it really depends on the shape of the car, driver, etc. Hope that helps a little.

 

Motor trend tested a LO3 with a T-5 in the early 90's I think the car had a 2.73 posi and 235/55/16 tires They managed a best of 16.1

My car stock 2.73 open 700R4 and 235/60/15 with K/N ran a best 16.8@81mph. Note 90* temps and a reclutance to shift to 3rd didn't help.

A freind ran 16.6 with a borla exaust.

Hope this helps

 

Well let me give you some more info. It's a 91' Firebird with an auto, nice shape runs perfect. I already have a Dynomax cat back exhaust, K&N open element, shift kit, susp and ignition improvements.

I'm planning on these for this summer, a 3" Dynomax cat converter, Edelbrock TES headers and 3" Y-pipe, 3.73's and a posi. As well as doing the ultimate TBI mods.

My next question is will this be a good enough setup for 14's? I'm hoping for 14.5- 14.7 ish. What do you guys think about this as far as times go. I know you'd all be guessing, but I'd really appreciate any thoughts you guys could come up with. Thanks again.

 

Yeah I have seen them in high 15's and high 16's. I seen only a couple in the high 15's though and they were on here, not at the track. So I say that a stock LO3 running high 15's is pretty rare and one running mid to high 16's is probably about right for the normal stock LO3.

 

You are probably going to have to do a cam swap to see the 14.5 area. I just did one and I posted my times of 15.02 @92.87 in really bad air and with some serious fuel pressure tuning issues. My next move will be to a 3.42 posi with some traction upgrades which should secure me in the mid to low 14's on a good day. Check out my mods to get a feel on what is need to see the times you are looking for. Going from a mid to high 16 to a mid 14 is a huge jump! Believe me...I'm almost there

 

I'd say you would run in the 15.5 area. With all those exhaust upgrades you will soon outflow your intake system and will need to replace it with an Ededlbrock or Holley intake. Also check out www.ramairbox.com you already have the open element filter so upgrading to the twin snorkel ram air box will give you 2 tenths and a mph. You would then be in the 15.1 area and then with a cam change and some tuning easily in the 14's.

 

Has anyone tried making that ram air box work with the ram air hoods from ASCD? I have been seriously thinking about it since they have to cut outs under the hood by the headlights on each side but I haven't seen anyone with a setup like that yet.

 

I put down 16.40 @ 80.40 bone stock (sans tuneup.)

Cat, exhaust, open element got me to 16.182, but the exhaust didnt do crap becuase my 3" to 2 1/4" reduction at the y pipe looks like ***. Once I get a decent y pipe, I expect to pick up the gains I shoulda got from the exhaust.

 

only good thing about having a 16 second car is that ANY mod is gonna show improvement when i get my exhaust done i hope to see a high 15 or ill cry...i know ill get low 15s probably with posi and gears...cam, heads, intake and all that good stuff helps but youll need some suspension mods to...im sure my car right now is horrible because my suspension is shot but getting replaced with KYB all around soon

 

I've only made 3 passes at a track ever, and the best i got was a 16.8 @ 81, with 2.4 60's. This was with my crappy old tires, and you can't drive around the water at this track Also was before the tune up parts, it just had the cat back and filter. Even then it was still lacking above 3500 RPM power like it is now. Seriously, it revs that high but has almost no pull at all until it shifts to the next gear at about 4500 (out of first).

Forgot to mention the runs were made on a very humid night in july 1/2 a mile away from the mississippi river after driving 95 miles to the track after work with no time to cool down. All runs made at 230 degrees, 3/4 tank of gas, spare tire and stuff still in the car. Also had Camrs89 in the car on the run as a passenger.
I'll bet i could at least have dropped 2/10s off with less gas, a cool motor, and, sorry mike, but flying solo.

 

lets just say that my 3.1 w/5 speed YES 3.1 beats them all the time with the few cheap mods I have.... And yes the roar of their flowmaster system tells me they ARE tring...

 

There is no way a 3.1 beats a 5.0 TBI, NO WAY! I've owned both, drove both extensivley and both were in equally good shape, it is no contest, not even close. You'd be very lucky to see 16's in a 3.1, best I ever got out of mine with a Dynomax exhaust and K&N was a 17.6's or so. Something doesn't add up there.

 

I don't mean to make anyone mad but my 92 3.1 5spd will give my 91 L03 a good run for its money, if not outrun it. they both have about the same exhaust mods and the 3.1 has a k&n and thats really it.

the 3.1 is kinda mean for a six in such a large car...
i can bark the tires in three gears
btw the 3.1 has 3.42 rear and the 5.0 has 2.73 (bet that makes a BIG difference)

 

Is tha why a kid with headers, and exhaust has made 2 of my car payments for me? 550$???He has an auto I have a stick. I smoke him all the time. he stopped tring after my last mod, ram air. he is tring to get NOS just so he can beat me! LOL Thats ok, I have a turbo coming tomarrow... installed in a couple months...

 

I have larger injectors (19Lb) ported intake runners, reshaped injector openings for better flow, custom Ram air. Completely spotless intake inside. NO CARBON BUILD UP AT ALL, and I have my air pump acting as a vacuum pump. Performance clutch, and bigger tires(wider) But other then that its stock... minus the turbo its getting in a VERY short while...

 

Great, why would you do that with a V6? You're plugging all that money into it, when if you invested the same into a V8, you'd be much bettor off. Just my .02 worth. If you have all those mods and that friend of yours is mostly stock, then I guess it could be close. All I know is that stock vs. stock, it isn't anywhere close.

 

This wasnt a "my 3.1 can beat your LO3" post. It was "what does the LO3 run stock?" Can we please stay on topic and stop bickering?

 

thanks chuck, needed that. my original question still remais I guess.

 

hmm actually to just let you know. I raced him when I had Just a K&N and I STILL beat him BAD...

I started doing little things to get a little more and he has stopped tring. EVEN THOUGH he has Headers, exhaust and I think even a spacer...

And FYI I have spent UNDER $250 on ALL MY MODS put togeather. HE HAS spent 150-180 on headers, another 250 on exhaust and I am still faster. Just FYI.

The injectors I got off ebay, stock 19Lb TPI $51 Sent to cruzin performance for clean/blueprint another $60 K&N $35 Intake roughtly $50ish. Oh and about $10 for 40 1/2" sanding drums for the porting/polishing of the intake.

Of course I am now working on turbo install($61 for turbo Ebay) and I have all the equipment to make the headers and cross over pipe. With about 6-7 PSI I am hoping to stay beside TPI's with about 270HP... Maybe a LITTLE more with some tweaks... And because I did get the injectors I should be good to go to around 12 PSI with some BIN mods.. then you still think he has a chance with NOS?...

The Hp/Trq curve of the 2 engines is almost identical. The 305 has just a little more trq but that goes away VERY quickly. The V6 is lighter and revs faster. I also have a 5 speed to keep the motor is the power band. Sorry to say but the LO3 is no spring chicken...

But back to topic The fastest I have seen a STOCK AUTO TBI run is about 17.2.... Sad that the Stock Sun Fire is faster at mid 16's.

 

Yeah and my quad 4 Olds Cutlas Calais runs under 16 in the 1/4 but I still wouldn't consider it a sports car. Glad to hear your cars runs nice with a V6, and thank you for putting me in my place abou thow much you spent on it so far. I didn't know you bought all the parts off e-bay. But for your FYI, I don't believe for a second that your car ran faster than his that close to stcok. I know the differences in the two cars I owned and there was NO comparison. And just an FYI to you, I hate the LO3, if you read any of my posts from the past few weeks you 'd know I've given considerable consideration to buying a Mustang. Only reason I asked the question in this post is b/c I'm trying to figure out if i can make myself happy spending reasonable amounts of money. Beginning to see I can't. I just want to keep my bird cause I love it and have sentimental value in it. So..... can we maybe stop ragging on which car is faster? Fact is 16's are still sad. Nothing to brag about in either case, AT ALL. If you love your car, then cool, thats what its all about, and I'll say no more. All I am saying is that for me, I don't care if you got it into the 14's, I still wouldn't want it. If you do, that is great, absolutely more power to you. End?

 

17.2?

Makes me feel good about my 16.4 I thought that was slow compared to what Ive seen some people have claimed to run.

Surly people have more times they can share, eh?