89IROCK

Try and do a long story short found a guy burning chips for TPI cars for $50 on facebook. Gave him all my specs and bolt-on's. He said my cams way to big to tune and is for a carbureted engine. He say there's no way that car should be running on the stock chip. To me the car runs good still waiting on his chip should have it in a couple days. Car runs 12.9s at the track running street tires spinning in 1 gear. I'm going for best drag time for this build. Here's all my bolt-on's below.

Bolts-on's
89, L98 block 355 11:1
Mini ram TPI intake, 58mm throttle body, 30 lbs injectors,45 PSI
Procomp cyliner heads 190cc,64cc
Long tube headers, 3 in Y-pipe, 3 in back
4:11 gears, running stock tire now
Walbro 255 lph fuel pump, 91 octane
700R4, with a Monster 3000 stall

CAM
Grind# CS 304H-R10
Gross Lift .600 for Intake and Exhaust
Duration @ .05, 245 for Intake and Exhaust
Lobe Lift .4000, SLA 110.0

The guys doing my chip suggested a ZZ4 or LT4 Hot cam. I think the ZZ4 is to small and the those cam are easier to burn for him. Do you think my cam is to big for tunning or to big for my setup? Open to your suggestions.

Thanks.

vetteoz

iTrader: (13)

A good tuner can tune a 110 LSA cam for EFI but usually requires sitting by a dyno; not by mail order.
With those specs it is going have a rough idle so may need tuning to run open loop @ idle to stop it flooding from the valve overlap

You get what you pay for

Orr89RocZ

iTrader: (20)

As said that one needs tuned in person. Its big for the combo imo. I would go 10 deg smaller

My 400 runs a cam that big and pulls to 7200

89IROCK

My plan eventually was to trailer the car to Oklahoma and have Ed Wright do the tune. I'm trying to work out the bugs before you go down there.

What about the cam that was in the TPI shootout Super Rod magazine Comp XR288HR (236/242, .520/.540) what LSA was this???

https://www.thirdgen.org/forums/tpi/...feb-super.html

Ive been having brake booster issues not sure if it related to my cam or other issues.

89IROCK

Xtreme Energy™, XR288HR
Street Strip, Rough Idle

http://www.compcams.com/Company/CC/c...?csid=190&sb=2

vetteoz

iTrader: (13)

Have you measured your engine vac ?

That cam made 400Hp on a 355 BUT with a carb
http://www.compcams.com/Technical/Dy...8HR-10_001.asp

FWIW; I only run a 236 / 242 (old GM 847 ) cam in my street / strip 383 that makes 400+ RWHP

Orr89RocZ

iTrader: (20)

288 is the biggest cam i'd run in that setup. Make sure valvesprings can handle the rpm! Tune will be possible but manners alittle rough. Low vacuum but should still function Brakes. Will be soft on low to mid range rpms til over 4500 rpm. Rather see 4000 stall for strip use. Street a 3000 is more than fine

Alittle smaller would be 282hr. Very good cam. Nice choice for a 355. About the biggest i'd go for a primarily a street driven car

89gta383

iTrader: (5)

I ran a 242-254 .575-.585 on a 110lsa in a 383 with miniram. The overlap is what will cause you issues, but you can tune it. Don't let anyone tell you they can't tune it. My vacuum was low and needed to raise the idle to 1200 and use a vacuum can. Brakes were hard as a rock.

I think you need a little more compression for that cam (I needed at least 11.5:1 but had 10.5:1).

Orr89RocZ

iTrader: (20)

Thats a good point to mention... Cams and idle speed

By tuneable, you can get most anything to idle... But at what rpm? A giant cam may idle 1500 rpm smoothly and be perfectly driveable lol even tho somewhat impractical. Dont expect some cams to idle stock 550-600 rpm lol

Most sensible cams need 800-1000

89gta383

iTrader: (5)

If he gets the combo right it will run good. Mine was all wrong, big cam with lots of overlap, 10.5 compression and small intake ports. Even at 1200 rpm the brakes were rock hard. I had to start stopping 50 feet ahead just to avoid hitting something or slam the trans in neutral for more vacuum.

To give you an idea of how funny cams are, i went from the 242-254 .575-.595 110lsa cam to my current 230-230 .600-.600 107lsa cam and it was night and day. I have vacuum now, driveability, idles at 8-900 and power up top to 6500. Overlap was cut in half with the current cam. It pays to get a custom cam sometimes, but even they are hit and miss. My current 230 cam is from bret bauer, the 242 cam was from advanced inductions.

Orr89RocZ

iTrader: (20)

Overlap is key. Lsa doesnt tell anything without the durations

89IROCK

Wow guys thanks for all your input.

88gta383- Your brakes sounds just like mine, do you have a picture on how you ran your vacuum can?

I think im going with the 288Hr cam. work on getting it tuned and fix that dam braking issue.