What if GM had installed the <modifed version>Crossfire intake on a '90 L98 long block instead of the L83.

My results: Stock L98 long block, Ported Crossfire intake, 2" bore housings, Modfied swirl plates, Stock injectors, Stock ECM with ADS chip, 5/16" lid spacer, 11psi fuel pressure.

Out of the box no tuning, trans shifted itself 4300rpm.

14.26 ET at 96 MPH
2.01 60ft on street tires
Altitude corrected 14.07 at 97 Great Bend KS MSL 1900ft and 90* plus ambient temp.

This is my youngest sons first race as the driver. This morning he still had a grin. Disney World eat your heart out!!!!!!!!!

 

Better yet, what if the crossfire intake had plenty of breathing from from the start- without having to port the friggin thing! :D

Nice work!
:thumbs:

 

will a ported crossfire breathe better than the TPI?

 

Ramanstud
I agree it would have been so easy for GM to cast the manifold correctly. But, N0-----

Dougs 90

The numbers I have show the stock TPI at 199 CFM @ 28" and the stock Crossfire at 176 CFM @ 28". The numbers for a ported Crossfire intake are subjective on the extent of the runner porting. From memory the ported numbers were close to the stock TPI. Of course the TPI is a dry flow system and the CF is a wet flow system. Is the CF better than TPI? No.

The Crossfire nay-sayers bring up the lowly 205HP performance and compare it the the TPIs 245HP of the newer year engines. How much of the performance gain is engine improvements(roller cam, aluminum heads etc) and how much is it intake improvements? The Crossfire intake installed on newer L98 would level the playing field as far as the long block goes.

I got a good deal on an '90 L98 out of a wrecked Corvette and doing the labor myself I have less than $20 in the cost of porting the stock intake and 2" throttle bodies. Looks like that with a little work the Crossfire can run with the majority of TPI cars.

The only part that really matters at least to me is that my son had a blast driving the car. In time trials he would be paired up against Novas, camaros, mustangs etc. Most had open headers, slicks, aircleaner sticking through the hoods- belching and a snorting and the ole quiet street tire, full exhaust Corvette just drove away from them. He woke up this moringing still with a grin.

Dan

 

Are you adopting? :D

 

Crossfires are :cool: People don't seem to realize that with just a little bit of work, they can be made to run very respectably. :confused: :D

 

Great results, Dan. Of course the enjoyment brought to you through the experience of your son, makes it all worth while. I have been trying to preach the potential of the Crossfire, for years. My own L83 "stocker", is on a par with your "L98 Crossfire". I have a similar induction sysem on an otherwise, factory stock, L83, untouched in it's 20 year life. It burns a quart of oil in 150-200 miles, but it still runs well. It has over 155,000 miles on it, including 600-800 1/4 mile passes.

My best ET is 14.72 @ 4500' altitude.
Typically, 2.05 60' on drag radials.
Altitude corrected to 13.91. The SECOND time I ran this ET, the DA was 8511. Of course, weather is NOT addressed in the correction factor.

A little tuning, should improve those times, for you. For me, I am hoping to finish building and install the engine I current have on the engine stand. Then...watch out!

RACE ON!!!

PS. Don't ask what I did to a 2003, LS1, C5, yesterday.


[Modified by CFI-EFI, 10:28 AM 7/27/2003]

 

Very cool results Dan, why don't you roll in a ZZ4 cam and drop the SY-1 intake on it and make a few passes. I would like to see that.

 

Only if it has an X-Ram cross fire base. That was a lower base being sold as to replace the crossfire base with a 4 barrel intake with a custom plate the stock crossfire upper mated too.

The whole thing was like $300 and some change and made it run as good as a 4-bbl carb car. Better all around than even the super-ram.




[Modified by BBA, 9:37 PM 7/27/2003]

 

:cheers: Great Job!

 

Unfortunantly the two closest drag strips are both 160 miles away. Verifing changes isn't convenient. The next big engine change will probably be the 406, SY1 and the large bore throttle bodies. For now, we will fine tune the present combination.

The boys are hooked now. Maybe we can make it to the track at least once more this summer.

 

What cam setup are you using??????
tony
:cool:

 

Dan,

Nice job. That is a very interesting result. The premise for your little "experiment" is what I have based my modifications on. Most of us that run xfire's believe the General "artificially" throttled the motor. TPI's didn't get 2/3's of a port on their manifolds. Replicating the newer technology the TPI and LT blocks had demonstrates that Xfire induction system can be made to run very competitvely with those motors. With work, LS-1's too. And CFI is pretty damned reliable too. That's not to say that CFI is better than TPI and EFI systems, but it just doesn't deserve the bashing it gets(especially the 84) from the rest of the Corvette community. You've helped dispel some of that. It must have felt pretty good to see you son surprising the heck out of those other cars. I am sure its an experience that'll be passed down to your grandchildren. Now all you need is to drop in a 7747 and do a little tuning. You should send your results to Andy Bolig of CF. He's looking for info like yours to do an article on CFI. :thumbs: :cheers:

BTW,

Dan does great machine work. I have a set of his TB's bored and sleeved to 2.13". They work great,


[Modified by Dominic Sorresso, 8:54 AM 7/28/2003]

 

Tony
Cam is stock '90 L98.

Dom
I hadn't thought about sending the info to Andy.

Dan

 

Slap a carb on it! :jester

 

Good going Dan, as far as the aforementioned Xram, I had one on mine before I changed everything. It gave me about 20~30 HP but I wanted much more and gave up on the Xfire. Prior to my change I had 1.6 RR's, Xram, 85 fuel pump and better ignition stuff for about 240 RWHP with improved torque. Good luck with the L83. :chevy

 

funny but i hit a telephone pole (worn tires, spun out in the snow at 60mph) in my '90 vette in february(?) 2003 in Maryland. totalled the back end of the car but i walked away without a scratch. good running motor w/ about 50k miles, was vette #4 and one of my favorites. maybe same motor?

 

The X Ram was a waste. Had it . The plenum top was about 3/8 to 1/2 inch deep( from what I recall) and ran like crap on a compucam 2040 or 50 cam , a ton of ignition work modded t bodies etc. I ported a few stock manifolds and they ran way better , smoother better idle quality mpg and faster. Car had 4+3 and 373s. I just found box it was shipped in at my shop. Was a Wieand manifold bottom.

 

any porting secrets? just bought an extra CFI manifold fm an '84 i think. can you recommend any particular burrs or kits? did you do more than just port matching to the L83 heads? !

really excited to put some power into this CFI motor, the chassis feels great and the wife loves the paint and interior, i might even talk her into driving it

Thanks! cloudshe

 

I'll pm you