Crossfire believer!
Thread Starter
Racer
Joined: May 2012
Posts: 354
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Crossfire believer!
I posted on C-3 general on my modified STOCK crossfire intake. To many there junk, I disagree. There way easier to tune than a carb set-up MUCH better on mpg and there nothing MORE than a simple tbi set-up. FAR less complicated than a carb ya just gotta understand them-EASY! I dynoed my 75,000 mile STOCK engine before rebuild, 202 hp @ 276 ftlbs of torque.On the rebuild I used TRW LW pistons producing 9.8.1, 0.30 bore, light weight forged rods, stock crank. Crane cam, specs 440/454,I-210/ E-216 true roller timing set, and Im scared of the stock heads [weak castings] so I set them aside and I used a much heavier stock casting head, fully ported 3 angle valve job using 110 lb spring pressure. 1985 fuel pump set @ 15 psi, stainless steel headers, 2-1/4 true dual exhaust w/ Flowmasters. Remember!still using the [junk] stock-MODIFIED crossfire intake, this 355cid engine is NOW producing on the SAME dyno, 368 hp @ 388 ftlbs of torque!!!! So much for the crossfire [turd] It did take me about 8-9 hrs to modify the intake tho. So MAYBE the crossfire is'nt so bad w/a lil time and effort!!!!
Thread Starter
Racer
Joined: May 2012
Posts: 354
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Yes at crank. I know its still no rocket however considering the bad rap of the crossfire intake I think overall it proves you can produce a respectable performing crossfire vette. It took alot of time porting that dam intake though!! My street racer is a 1985 Buick regal w/ 1987 GN engine and drivetrain.........now thats a rocket $16,000 in JUST the engine at the crank that engine produced 648 hp/628 ftlbs.$$$$$$$!!!!!!
Thread Starter
Racer
Joined: May 2012
Posts: 354
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Yeah not too bad, go to the general section on what all I did to the stock intake, if you're interested? Thanks for the thumbs up! peak hp was at 5600 rpms in comparision prior peak was at 4200 rpms. I think,I might be able to get a lil more out of it w/ a chip and injector change. I did try using a 1/2 spacer on the plenum NO INCREASE! So much for the plenum argument on volume! Took it back off, so much for that bunch of work FOR NOTHING!!
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Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
Did you lose any low end torque? That one thing I really love about my 82 CFI is its low end torque. I've owned many big blocks and that little 350 has the same grunt as a 454 or 455. Then it falls flat on its face at 4800 rpm
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Racer
Joined: May 2012
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low end torque
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
No the peak torque came at only 300 more rpm's and below that the #'s were consistently higher. I have a 1990 SS 454 truck thats rated at 230hp/385ftlbs of torque?? After BLOWING the doors off a Dodge hemi 1/2 ton truck rated at 390hp????, i think the factory rating was at the rear wheels on the SS 454? I rebuilt the 454 about 7000 miles ago .30 over [about 462cid now] mild comp cam, ported heads and gutted cat w/dual 3" exhuast. Educated guess is about 335-365hp/425-455ftlbs of torque at the crank? It pulls HARD to about 5200-5300 rpm's. I think the new hemi is OVER-RATED!
they just need aluminum heads and an overdrive 
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
I did a new cam,85 fuel pump and ported the intake on my 82 cf.Great improvement in performance.the new intake that they have for the cf should be a big improvement in hp and you dont have to do all the porting .if it would not have cost so much i would have like to have the intake extrude honed http://boneheadperformance.com/extrude-honing/
Thread Starter
Racer
Joined: May 2012
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Dam straight on the OVERDRIVE!!! SCREAMING AT 65mph the turbo 400 hard to beat I;m looking in to the Gear vendors overdrive unit, it will make it a 6 speed and in the overdrive 6th gear will make the 3;73 perform like it has a 2:92 in it.
Thread Starter
Racer
Joined: May 2012
Posts: 354
Likes: 0
Thread Starter
Racer
Joined: May 2012
Posts: 354
Likes: 0
Afr??
AFR only thing I can think of is AFR research, the make high performance heads etc, the TB's are simplier in design no floats, jets, metering blocks, chokes etc, etc. TBI.s are WAY easier to re-build and pretty much-MUCH more reliable. Yes you can use a Q jet or any other carb for that matter, you gotta change the intake! and a bunch of other crap AND you will lose MPG!!!!
Thread Starter
Racer
Joined: May 2012
Posts: 354
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how to post pic's?
OK I consider myself pretty much an expert on SB chevys and the 3.8 Buick turbo motors been racing all my life, I'm 55 yrs old now. However MUST be VERY stupid on my smart ph [smarter than me] and my laptop how in the heck do I retrieve pic's from ph to my laptop so I can post pic's on this site????? I know I use the usb port past that I'm lost I did last year port some pics from ph to laptop BUT now I can't seem to do it ??? And would REALLY like to post some pics on this website!!!
Any help from a member WOULD be GREATLY appreciated!!!!! Thank you Lance.
Any help from a member WOULD be GREATLY appreciated!!!!! Thank you Lance.
Race Director
Joined: Oct 2000
Posts: 15,009
Likes: 79
From: central FL, near the beach.
Why would mpg go down? Bill Jones reported 29.9 mpg with OD and a qjet. lots of tuning, but it takes a certain amount of fuel to cruise, and that is it. The AFR is air/fuel ratio.
Your statements don't add up, that is why i asked. Can't make the power you claim with a stock ECM. It would run lean and burn a hole in a piston.
Also i can't recall anyone pulling out the ECM w/harness to do engine dyno tests. I'm sure you will post pics.
Your statements don't add up, that is why i asked. Can't make the power you claim with a stock ECM. It would run lean and burn a hole in a piston.
Also i can't recall anyone pulling out the ECM w/harness to do engine dyno tests. I'm sure you will post pics.
Thread Starter
Racer
Joined: May 2012
Posts: 354
Likes: 0
Why would mpg go down? Bill Jones reported 29.9 mpg with OD and a qjet. lots of tuning, but it takes a certain amount of fuel to cruise, and that is it. The AFR is air/fuel ratio.
Your statements don't add up, that is why i asked. Can't make the power you claim with a stock ECM. It would run lean and burn a hole in a piston.
Also i can't recall anyone pulling out the ECM w/harness to do engine dyno tests. I'm sure you will post pics.
Your statements don't add up, that is why i asked. Can't make the power you claim with a stock ECM. It would run lean and burn a hole in a piston.
Also i can't recall anyone pulling out the ECM w/harness to do engine dyno tests. I'm sure you will post pics.
ECM up and they used there own harness as this shop does alot of different engine set-ups as far as burning a hole in the pistons I beg to differ, I know some one that used a hotter cam then mine and "AFR" aluminum heads on his 84 crossfire vette using the FACTORY ECM and his engine is STRONG! If you use ENOUGH fuel you WONT go lean! On the DYNO the a/f/ratio was at the ideal ratio of 12.1 on the strongest pull, timing was set at 11 degrees BTDC and before we made a few full pulls we had to set the fuel pressure up because it WAS too lean, starting at 10psi, 15psi put this engine right were it needed to be. I'm 55 yrs old and when it comes to SB chevys AND 3.8 Buick Turbo engines I consider myself VERY well educated I've built over 20 SB chevys from a 283 to 400's and everything in between. REMEMBER every combination will result in using different tuning parometers. The chip CANNOT be effective in richening the mixture at WOT. For that you have to go UP in fuel pressure OR injector size-PERIOD. I do know what I'm talking about I promise you that! Anything above a 1990 model NO I'm NO expert there.