Anyone out there ever put a stealth ram on a 383 running a MAF and have sucessful results?

383, HSR, AFR 195cc heads, 10.5 cr, 224/230 510/540 112 comp cam w/ HS 1.6 roller rockers, 32 lb injectors, 58mm tb, msd dist. and 6AL, 700r4 super servo, 9 disk clutch pack, 3.23 10 bolt

 

I know of one that does ok but its not as wild as your setup

 

hey jmalczy you are almost running the same set up as mine. i am having problems running with the stock computer with a custom bin. i am in the process of purchasing the fast xfi. i could never get the car to run right with the tune.

 

Hey smokefan, Im going to be working on my car in the next couple of weeks and hopefuly I can get it running. I just found a guy who swears he can tune my stock computer with the MAF and dyno tune it with good reults. I'll let you know how it goes, and let me know how the fast xfi works out if you get it. I also had a buddy with a 355 HSR in his iroc with the commander 950 and his ran great, so i might just have to dish out the grand and get it.

 

The maf sensor is not your problem, the tuning is. I've run way wilder cams with the maf and never had a problem with driveability.

Thought the maf was holding me back and switched to sd, didn't pick up any power at all, things being equal.

 

I am running a 383 HSR in my Vette with the same cam.
I have much better luck running open loop.
John

 

jjvette, i havent had the chance to drive the car with the hsr 383. how does your car perfrom? i was setting the bar low when i stared the rebuild. with the 350 i was running 14.2 1/4 miles with the worst tires money can buy and had no traction. I was aiming for low 13's to high 12's with this set up and would welcome better of course. i havent driven the car in about 2 years so id even be happy to drive a 14 secound care again as bad as that sounds. also, what computer are you using?

 

so its all about the computer tune? theres nothing that a good dyno ECM tune couldnt fix, right?

 

JMALCZY,

I would say with the right tune your car should be in the high 11's.
The 383 out of the box before dyno tuning ran 12.16 @111.xx mph. That was with 311 rwhp. I dyno tuned it and picked up another 40 rwhp. I had to stop tuning though as I ran into a glitch with my software. I know there's more left in the tune once I get back to the track.

John


rwdtech,
As long as everything is working correctly then I would say yes it can be tuned to operate satisforily. I guess it depends on the end users expectations though. A 224/230 cam at 112 is not big at all for a 383. The more mods the more time that must be spent on the tune. The cruising tune is the hardest to get perfect. That could take years.

John

 

Thats great news john! Thanks for your input. Before i put on the HSR i was running a modified TPI and your right, at WOT it ran strong but in cruse it would run like crap. I couldn't us OD because as soon as it went into 4th it would stall and i would get a code 33. The same thing whe i would break torque it, it would stall and throw a code 33.

 

You can change the parameters for the code 33, or disable it altogether, and thatll stop the problems with too much flow. One of the bigger problems is teh 255 gms/second limit in the ECM. Youll have to fiddle with the PE parameters to get the right ammount of fueling at WOT when the MAF is maxed out.

 

This about the same set I am working on with my 85 TA. The engine is installed but not started yet. I plan on using the stock computer to get things started. I am having a terrible time changing the large diameter distributor from the 85 to the small distributor from an 87. I have not been able to get spark. Keep me informed on how you are doing. Can you send me any photo's of the set up? I need to buy a new hood also.

 

mmeldrum1,
I had a similar problem. It took me a week to figure it out took. This might not be your problem but this is what my problem was. One of the connectors that goes to the distributor is the same as the connector for the manifold temperature gauge that screws into the bottom of the plenum. It was a simple and stupid mistake but as soon as i switch the connectors it fired right up.

 

mmeldrum1,
I'm doing also big to small distributor swap to my -85z.Any ideas where I can find that gray connector to external coil?

 

you are also running a vette not an f body....


jmalczy you are running the EXACT same setup as me.....i still have to put my 30# svo injectors and 255 fuel pump...im curious as to what you're power numbers will be.....keep us posted

 

Found the connector I needed at the local bone yard. Clipped it off of a Chevy truck wire harness.
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I dont think this is my issue since I had to splice that connector in since I was changing from the large distributor to the small one. I am just worried I did not switch wires correctly. Sorry for latching on to this thread with my problems, I will start a new one to answer my specific questions.

 

Not a problem, Im more then happey to welcome any dicussion to help out. Sorry I couldnt be of more assistance.

 

My connector came also at bone yard.Problem is it haven't tacho lead,trying to find connector that has that lead.I buy an adptor harness to that swap: http://cgi.ebay.com/ebaymotors/TPI-L...mZ220102355839

 

Anyone know how much the stock 5.7 liter fuel pump flows. I replaced mine before my rebuild and havent replaced it with a hi po yet. Is this a must or can I get away with the stock pump?

 

jmalczy: where are you in Michigan? You are invited to come over to my house.

I have a stroker 395 cu.in. 1987 IROCZ running the SuperRam with a MAF. Last October, I ran a 12.12 sec @ Milan. I am running the 165 stock ECM with my Eprom. I'm convince that you can run the factory ECM with a highly modded Eprom and run very fast. The Eprom for your 383 HSR should be close to mine, at least my latest Eprom is a good place to start.

About the fuel pump; I am running the TTA fuel pump. The TTA fuel pump is rated at 227 l/hr, while the stock fuel pump is rated at 150 l/hr. I think that you best upgrade your fuel pump now.

 

Dimented: I have seen several of my buddies here make the same claim about the 255 gms/sec air flow limit. However, I "see" no limitation with my 395 cu.in. stroker running a MAF sensor. Afterall, there is at least two PE tables whereby you can program in enough fuel to acheive 12.8:1 AFR at WOT. The 255 limit might be a problem if that occurred during cruising, but that never happens. By the time I get over 200 gms/sec flow thru the MAF, the ECM has gone into PE mode.

Last nite I did some tuning with my experimental 3.5" OD MAF. My wide band O2 meter was reading from 12.5 to 12.8:1 AFR. The car is ***** out fast! I hope to break into the 11s this year,, NA of course.

 

Hey doc, i live in clinton township. I would love to come over and see your set up. I just got the car started today and it ran great at first but as soon as it warmen up and went into closed loop, it ran terible.

 

I am guessing here now, but I would expect the ECM to go out of range as far as its learning process in concerned. We will have to set up a meeting. I might have to come to you if your car is not running good. I can run my scanner on your car to see whats going on. Send me a PM on your home address, maybe we can meet this weekend and see if your car will run any better on my Eprom chip.

Also, I have my ECM tuned now for my experimental 3.5" diameter MAF,, but for you, I have have a great tune for a stock MAF with the screens removed and 24#/hr injectors.

 

Thanks for your input. I have a GM Tech 1 scanner ( I used to work at a pontiac dealer and we had a spare), 2 EPROMs, a ZIF adapter, and tunercat, but I don't have a laptop. I also have the interior out because im doing a 4th gen dash swap right now,l but i would like to talk more and see what we can't do. My email adress is jmalczy@yahoo.com.