Gotta a buddy back in my old home state building a little street/strip ride.

He runs to his own drummer and is a big fan of the K.I.S.S principle...

It will be a low budget 2500# (him in it) with a glide or th350, 3.27 geared with a turbo L33 (or possibly a 4.8) Dr.Jekyll /Mr.Hyde type of ride when done.

His plan is to bracket race it on the weekends running 10.0s (any faster and he will need a cage. engine blanket etc.)

But wants to be able to put the "smack down" on the rare occasion (and getting rarer, do to lack of roads, to many people/police and the long drive to "Mexico" lol) to some of the heavy hitters on the street (mid 500 ci big blocks running low 9's high 8's)

To pull this off Mr. Wallace and his calculator, says it will need 500hp or so to run bottom 10's and 700 or so to run high 8's.

So...This is were the collective brain trust comes in...

He is a stubborn old fart and set in his ways...

He wants to run with no cooler or meth inj. and wants to bracket race with just the crappy 91 pump gas on low boost and wants to run 100 low leaded av gas (the only thing available) on high boost for the occasional "smack down".

So...What's it going to take to "hot lap" it bracket racing and also be able to gain the extra 200hp he needs to run with the "big boys" on the street with just a twist of the dial and the 100 av gas ?


There are a couple things that might help...The low weight of the car and the temp in his state in the summer is high 60's to low 70's.

Some questions that come to mind are...

What boost to make the 500hp "bracket race" level ? 700hp "smack down" level ?

Run the 10.1 compression or throw some 317's on the L33 to lower the compression ?

Would the shorter stroke 4.8 help ?

How about cam selection...?

What size turbo ? With the lowest weight/cost as a factor.

Plus anything else you can come up with.

I have all ready given him my ideas (with hiding a "sneaky pete" and spanking it with a 100 shot at the top of the list. lol)

I told him I would bend everyone's ear on here and get their ideas. (He doesn't do the internet)

Lets hear what you've got...

Oh...And thanks in advance.

 

Of those choices, the L33 would be better than a 4.8 IMO. 80lbs lighter and more cubes.

Would need to be really low compression to do it on pump gas. Esp. without an intercooler or meth injection. 317 heads only drop about a point. I'd say thats a must. The L33 has flat top pistons so you'll still be around 9:1. (still too high IMO) You could play with aftermarket thick head gaskets to get the compression down farther. Cometic will make custom thickness gaskets. I've seen as thick as .071 sold by vendors. You can get them in the 2mm + range.

My other suggestion would be a cheaper gen3 iron 5.3 with dished pistons and 317 heads. That would put you at 8.6:1. I picked up my gen3 iron motor for $220. Slapped on 317 heads and ran 8's at 25lbs. I was also intercooled and using E85. (2850 race weight)

Keep your timing low (like 10-12*) and take baby steps with boost watching the plugs. I doubt it will get anywhere near 700whp without good fuel and or intercooling with a 9:1 motor.

I'd also suggest twin turbos or a really big single to help keep the turbo in a good efficiency range with the coolest possible charge temps.

100LL is a tricky fuel to use because it's designed to be burned at altitude. Oxygenated fuels will burn differently than standard fuels and can make tuning tough. You can't just dump it in and turn up the boost. You would need a completely different tune to run it correctly. I wouldn't use it personally.

 

10s to 8s from 500 to 700 HP is a major stretch.

700+ HP in an L33 at 10:1 on 91 with no intercooler no meth isn't happening. 500 HP maybe, but its pushing it above that. Meth kits can be had cheap and setup very simple. No need for that progressive stuff blah blah. Simple one stage kit that comes on at a certain PSI and has a constant flow can be had for 200 and just needs power/ground on a Hobbs switch, nozzle screwed in before throttle, and some windshield washer fluid.

Don't need a special cam with the L33. You can hit 700 flywheel HP pretty easy with one of these. Larger cam will help a little with the pump gas situation though.

Bang for the buck, a BW S475 is good for 1000 HP and some places carry them for about 700 bucks. They also fit within the 76mm rule that lots of classes use for turbo size limits.

 

Bracket racing that setup will be difficult. Without an intercooler he will have consistency problems. If you hot lap it you will have some major over temp problems, detonation.

Av gas is not recommended in cars. It has a higher octane but is formulated for a completely different environment and engine design.

Good luck.

 

Thanks to those that replied...

Will help reinforce to him what I have been telling him all along...

That it would be a long up hill battle doing it the way he wants to.

Did I mention he is a stubborn old fart and set in his ways...

Oh...And about the Avgas... It's pretty much all we ever had back in my old forsaken neck of the woods...Race gas was about as rare as kryptonite and you needed to take out a mortgage on your house to buy it...

The old "green" 100/130 worked pretty well back in the day.

The 100LL is a little trickier but doable...Then again that was running a carb...

EFI might be a different animal all together...Never have had the opportunity to try it...

Old Bill is pretty sharp with tuning efi...If I can get him to stop being so damn stubborn and build this thing right...I think he will get 100LL to work.

Again thanks for the comments..

 

Back in the day you are right we didn't have the choices in fuels, so we used a lot of things that we wouldn't today.

There is no reason to limit ourselves to what was available. Make use of all that today has to offer. Doing that will provide much better results with less stress, expense, and failures.

Good luck

 

ss performance...

That is still the problem up there...(Up there, being out in the sticks of Alaska)

100LL is still the cheapest thing around with that kind of octane...

It's insane how much a drum of race gas cost there.