93 mustang 5.0 et guess

My cousin has a 93 hatch and built a pretty nice engine for it. It is a 306 flatop pistons, f303, gt40 heads, roller rockers, cobra intake, 19lb injectors. It has a t5 and aftermarket clutch. It has 3.73's in the rear. He had the car at the local track last week and ran a 9.39 at 78 on street tires spinning bad. I had an old set of 26x10 et drags that I let him have. He mounted them and with him driving he couldn't do better than a 9.04 at 78 I believe with a 2.02 60ft. He let another guy drive it thats a little crazy and he ran a 8.77 at 78mph with a 1.87 60ft. He launched around 5000rpm. He was a little dissappointed in the performance. He were all thinking the car should go in the 8.50 range easily. He was shifting around 5500 rpm and I was thinking it needed to be around 6000 but not sure. Anyway whats your opinion.

 

for the f303 cam, i'd shift it around 6k if it was me. i just pulled one of these out of my '94 Cobra and it pulled like a b*tch all the way to the rev limiter at 6250....

as for the engine itself, i'd say it's doing pretty good with those little 19lb injectors. id tell him to step up to at least 24's with a 255 pump (an adjustable FPR with about 18* timing wouldnt hurt either )

 

he had 24lb injectors in it and it ran real rich. The guy that tuned it said the 19lb ones were good to 400hp so he put them back in.

 

Car should run easy 8.50s or better. I'd check the timing & raise the shift point up to around 6000-6200.

 

I was thinking the same thing. we should be going back to the track tomorrow. I am thinking it should trap around 83mph

 

Yep, after we ported the E7s on mine(the Maverick, carbed) and put in the B303 I got it down to 8.79 at about 78 mph. And he's got more motor than I had. With the above mods, my motor pulled pretty good up to 6200, and that F cam should do just as good or better.

 

the 19lb injectors are defintly too small for that motor build. ford put 24lb injectors on the 93 cobra and it only had 245 hp. you cant just change the injectors. you have to fool the computer by using a recalibrated mass air or use a chip to reprogram the computer. i had a similar build in my car and it would run 7.8s at around 90mph. the other thing is that high performance clutch on a stock t-5. if you power shift it will brake the t-5. i would use a stock replacement clutch from pepboys with a life time waranty. the stock cluth would slip enough that the shock load from a power shift wouldnt be strong enough to shater the t-5 gears. having a performance clutch and not power shifting is a waste of a performance clutch. also launching with a 1.87 60 ft on slicks is asking for broken axles if they 28 spline or a broken trans.

 

my buddy had a 93 chp mustang ''tremmec 5 speed '' stock block with '' E303 cam '' edelbrock intake port matched '' stock e7 heads port matched '' 19 pound injectors '' after market pulleys '' 373 gears '' bbk long tube headers '' bigger mass air flow meter '' cold air intake '' flowmaster exhaust ''

his best run was 14.1 it could run better with some sticky tiers and a more experienced driver

one race he did with these mods

 

agreed. when I heard about leaving at 5500 I was thinking this won't be good. Luckily it didn't hurt anything. what kinda 60ft do you think it should have. I was thinking at least low 1.80's or high 1.70's. I think the slicks are just to much tire for the car. We were there with the car hauler for when it breaks. lol

 

We were there with the car hauler for when it breaks. lol[/QUOTE]

lucky you i went to the track 2 times and had it towed 2 times i hope 3rd times the charm

broke the 8'' rear twice now 9''

 

lol, the guy doing the tuning is full of it then

the stock 19's barely support the engine in stock trim w/ bolt ons..... but like Bryant said, the MAF has to be calibrated for the injectors as well

 

That combination with a good driver shouldnt have any problem running 7's. My car with a rebuilt bottomend and home ported e7's and an f cam went 8.0's

 

Theres PLENTY of people running hotter setups with only 19LB fuel injectors, put it on the dyno I would bet money your not running lean "cause out of injector". 19lb is fine for a gt-40 setup.

If 19's where not fine what about ford putting them in the explorers and mountaineers both gt40 and gt40p heads. Cobra's got 24's IMO cause there "cobra" engines. Not really cause they were needed.

Sounds to me like the car may need some testing on optimum timing, and drive it like it was stolen.

race weight?
Exhaust?
Suspension?
Lower intake ported?
D/A?
Temp?
Valve springs? <------------ Were they upgraded or are the junkyard explorer springs
Were heads freshened up any?

 

i would bet those 19lb injectors are running around a 80% duty cycle at the higer rpms. thats the max the computer will take them to. that motor should be around 300 hp. it needs biger injectors. playing with 19s thinking they are just fine is selling your self short. the explorers are not about top end horse power. how many of them see over 5000 rpm. smaller injectors are beter for lower rpm efficency, thats why the explorer motors use them.

 

Disclaimer : not trying to argue here, just another point of view.........

If said computer is going over 80% duty cycle it WILL throw lean codes..... Is that happening? If so why is it running down the strip throwing lean codes?

I also don't think that that motor is putting down 300, I would say 280 is a more realistic number and at 80% duty cylcle within range of 19lb's.


What I'm trying to say here is in my opinion the injectors are NOT holding back the timeslip, is he close to the edge of injector usage? maybe but the injectors are not out of range. 19lbers will go a bit above 19lb without going static, even more so on the nwer style explorer injectors. A couple pound bump on the FPR is all that is needed.

The AFR readout on the dyno run will show weather or not he is "out of injector", can we see a copy of that? Did the guy that tuned it give him a print out, and now that I think of it what were the dyno numbers from tuner?



And other note, when was the last time anyone was out with the "new setup" and hit there time slips right off the trailer. Takes trial runs and seeing what the whole combo likes and doesn't like.