I got my self a 87 IROC with a built 350, ZZ4 cam, headwork, Weiand Dual-plane intake, 600 carb, full exhaust, 2500 stall, B&M 700-r4, 2.73 posi rear.

Question is can I beat a 99 SVT Cobra??? All thats done on that is an exhaust.

Also, what kind of HP and Trq numbers will I be putting out at the wheels?


thanks

 

I hate 2 say it, but that svt corba will take u in a heart beat!

 

The 99 cobra is not supercharged correct? Its only a 4.6 DOHC. If this is the case i say youve got this one in the bag, for sure.

Theyr only hi 13 second cars

 

Depends on the 99...

I assume it is a post fix car. Figure high 13s stock with a decent driver. Then we add exhaust (whether you mean catback, or Long Tubes, off road X, and a free flowing race catback) and it can be anywhere from no faster to low 13s. I would say come into it expecting a good race and run it. Worst can happen is you lose.

 

good point i forgot 2 look at the year (99) not factory supercharged----run him down---- thirdgens rule!

 

Sweet. Any guess's as to what Kind of power ill be putting out?

 

1st of all what do you mean by "built"? Forged parts, has the engine been rebuilt or bored over?

You should switch for some higher(numerically) gears. It will help you out ALOT, especially with that carb setup.

 

OMG yes, 2.73's are no where near ideal on that setup.

 

quickest stock cobra's i seen are 13.3's at 103mph. some may hit 104. exhaust might put him at 104-105mph. your combo sounds like it will be around that but your gears are hurtin you. get some 3.42s and you'll have this one in the bag.. but it will be a close race. all depends on the cobra guy's driving skills

 

All 99 Cobras have had the fix and actually they post slightly higher numbers than advertised. That means about 280-285 at the wheels. Full exhaust on one would make around 20-25 at the wheels. That leaves the cobra around 300-310 at the wheels.

These cars LOVE to pull up top. My '01 felt its strongest at 6750 rpm's. Their quarter times aren't fantastic due to the IRS (Independent rear) giving a difficult launch, even for good drivers. If this is a drag race from a stop you could take him through the 1/4.

 

Yes the power curve is very peaky... interesting feeling coming from a v8 car... especially compared to my TPI. Anyways race and post the results.

 

They sure do. My buddies 97 Cobra has gears and a catback (no cats). He raced my buddies LT1 and they were dead even, then he started yanking him pretty good up top.

 

I rebuilt the engine with stock parts. And yea I know the gears suck, but i have a 4th gen rear with 3.23's that will be swapped in this winter or if this rear i have now goes pop during the summer.

 

amen to IRS sucks at launch. all kinds of problems. gotta love the camber changes, pinion angle change (eevn though it is slight), change in track width, all cause nice traction loss if not wheel hop. you should drive a IRS car that has a broken diff mouth that controlls up down pitch and talk about wheel hop on one of them. ICK plus on my car from my understanding acceleration will even cause changes to the rear wheels toe in/out.


sorry I'm just ranting for a moment. cause I'm pissy


also isn't that IRS in the corbra known for being weak and breaking fairly easily?

 

cobra weighs around 3450lbs-3500lbs or so. with 280 at the wheels, they should trap more than 104mph which is about the best i'm seein from the guys at svtperformance. i would think cobras are more like 270s at the wheels

 

They dyno extremely close to LT1 M6 cars, 270ish.

 

Where am I performance wise matched up to a stock LT1?

 

Id have to just guess. But i think your making maybe afew more horse then that cobra, far more torque, and you weigh a little less. (Assuming that 3450-3500 someone said is correct)
----------
With better gears you should be able to beat stock lt1s no problem.

 

When you guys with these modified carb'd motors get on here and ask what you might run it is such a crap shoot, especially with no dyno numbers or 1/4 mile times. I have seen very mild carb'd 350 cars go low 14s and healthy sounding ones high 15s. We can only assume you are in a very good state of tune which your car may or may not be in. So we say based on a good tune you could run a stock Cobra, but you go race him and he blows your doors off (which is most likely in my opinion) and we did not help you, only gave you a false sense of security. Just go race him and post the results.

 

Just trying to get an idea of where im at performance wise

 

Yeah im assuming a great state of tune.

 

Well I ran an 89 IROC. It had stock TPI induction, ZZ4 cam, stock heads, headers back exhaust, 2200 (i think) stall and 2.77s. I had him by two cars at 110 mph. This was in my '94 automatic LT1 with just a muffler - it ran 9.0@80/13.9@100.5 on a 2.2 60 foot at that time.

You're probably quite a bit faster up top, with a carb and some head work (what's done exactly?). I'd give you a trap speed of about 103-104ish, maybe more depending on your heads. So you should be able to walk a stock LT1, but it's hard to say for sure without track times.

 

I got them back from the shop and they said they had to somehow angle the valves to get correct lash on the spring of something. Said it was good for some more flow. I dont remember exactly

 

what's your exhaust setup?

A 3 angle valve job? It's a common repair procedure when rebuilding heads.

 

i think cobras got a better gear like 3.08 or something like that....and im sorry but i'd also give this race to the cobra. And i would think that your car would be puttin out like 250 hp & 300 lbs torque at the rear wheels. You definately need better gears more than a 3.23 try a 3.42 or get the 3.73 which would be the best for your carb motor. I use to play around with my buddy's 94 cobra with my 305 tpi but he'd walk all over me in top end but I would give him a run for his money in 1/8 mile almost up to 1/4 all the time since mine was auto and he was bad at standard driving ..so just hope the cobra is standard and messes up. I also played with my buddy's Lt1 standard T/a and he always messed up too. SO i think auto tranny would give you a consistent run. I also had a Lt1 stock auto and that thing was so much better than anything i'd driven with a V-8 but did get my **** handed to me all the time too. even though i thought it was the shizznazz. Oh and i still prefer the Lt1 over all these porshe's, bently's, Bmw's, & Mercedes V-12's I drive daily. "Except for the Mercedes v-8 compressor "

 

Edelbrock headers, hi-flo cat, 2.5 intermediate into a aerochamber

 

i dont know if you have tried this or not but try looking up drag times on your computer of 99 cobras and lt1's then have a buddy time you it's the easiest way to see if your car can hang

 

hey bro i just joined up last night how long have you been a member

 

A lot of those sites are very inaccurate.

 

Apparently the 99 cobra was rated (by ford) to have 320 fwhp and in reality was more like 280-300 fwhp. Looks like they ran roughly a 14 flat stock with a pretty high trap speed.

It also came equipped with an IRS so you had better get him off the line, because thats where hes going to have problems. Top end he'll be reeling you in im sure.

 

And you read this where? A lot of what you read doesnt hold a candle to the real world. Not saying it isnt true, but there were issues with the 99 cars. They had less than advertised power, but after the "fix" they made advertised numbers (270 or more to the tires) and with a few bolt ons will put down 300. Not to mention with a gear and a driver will run with an LS1. They were ripped on because of the issues but when fixed were nice cars and made power.

 

hold up, Front wheel horsepower?

 

Just a basic L98 with full exhaust, stall and ported tpi can run with those cars, if they are stock. I don't see why yours can't run atleast a low 13 second. It's gonna be hard for him to play catch up. I say just open a bottle just in case.

 

if think if u have some tires and can really launch that bitch you'll run a mid 13 and yes that's enough to take a stock LT1 or a stock cobra of those years in the quarter. imo the LT1 & cobra will trap the same as you though. Open up your exhaust a little more (LTs, 3" pipe) and you would see good gains. Might want to dial in your carb jetting at the track as well, there might be something there.

 

My whole top end(heads, cam, intake carb) are just temporary, along with exhaust. all will be new and top of the line by next summer. This is just a temp setup to get her going. thanks for all the replies. When and if he wants to throw down, I'll let you guys know every single detail

 

damn it mcamit. haha lol I'm funny


more fly martymcflywheel horsepower