1991Z07

I've heard from some different sources on the Forum that the TPIS MiniRam did not flow well to the rear 2 cylinders...made tuning a nightmare because of it.

Might want to search through the Archives....should be plenty of information there.

mseven

I was seeing that #7 was noticeably richer on the plug and was progressive as I would read the plugs in order on the bank. Some creative fuel/timing tweaks, (particularly w/idle/off idle and de-cell from 1600rpm and down) have helped that, now the burn is pretty even across the board. I'm not sure if you would see this same thing with stock heads/cam etc.
All in all I don't thtink that should detract some one from choosing the mini, once you start modding I think they all will have some issue, JMO

steven mack

Kopbet are your mini ram numbers with the stock motor.

CentralCoaster

And no MAF feedback.

Red Tornado

Quote:
Originally Posted by steven mack View Post
Kopbet are your mini ram numbers with the stock motor.
no worries. he knows better than anyone else.

Vic'89

I have run both setups very recently. With over 5 years of track data with a TPI setup, I can say that as soon as I went with the Miniram\ZZ9 Cam\Ported heads combo, I did lose low end torque.

Since my torque convertor(2400 stall) and gearing(3.07's) was still the same, the Miniram made my setup lose the low end killer torque that I had before.

TPIS will also state that you need a 3000 rpm stall and 3.73 gears as a minimum requirement for a Miniram. I have NOT done this as of yet.

The Minram also wants to shift at the higher RPM, like 5800 - 6000rpms. My Tranny is shifting at the TPI setting of 5100 RPMS. So again, my shift points are not optimized yet.

So with what I have so far, I did lose 60' time and gain top end MPH.

Vic

Fastmax32168

I have both a modified TPI car, and a modified LT1 car.
The lower RPM power made by the LT1 car pales next to the TPI.
The top end of the TPI pales next to the LT1.
All of my tweaking on the TPI after my initial mods has been to try to improve the high RPM power.
All of my tweakin on the LT1 after my initial mods has been to try to improve the low end power.
In spite of this the LT1 still makes max power at 6100 RPM, and in spite of some heavy mods, the TPI still runs out of breath by 5500.
And the TPI will still leap ahead of the LT1 until it catches its breath.
Then the LT1 is gone.
The bottom line is they run about the same, they just get there differently.
So pick your poison.
My answer to your question is yes the miniram really doesnt make any low end to speak of. Your motor makes low end because it is a 350 cubic inch V8 in a 3000 lb car. But those short little runners do nothing to enhance it.
Roy

kopbet89c4

My motor is essentially stock. Basically, its just a MiniRam slapped on and it dynoes as a healthy stock LT1 would, give or take 5 hp. The stock 89 cam is the hottest of L98 cams. Duration is 207/213 in/ex. lift is .415/.430 in/ex w/1.5 rockers, 117 LSA for a smooth idle. I had it tuned to run richer up top in PE mode and slightly enlean the A/F ratio at idle. Even then, my car still runs a little rich in warm up. In closed loop mode, BLM figures are normal, as if I had a working MAF. The spark/rpm/load tables are exactly the same. Car runs excellently when tuned without the MAF. I get the best results when the car is dynoed when coolant temps are below 180 degrees.

kopbet89c4

And I can prove that. No stalling in the last 5000 miles. Runs great in the street or strip. Its a solid 13 second car and traps routinely at 104 mph! The TPS signal alone can essentially be substituted for running the car without a MAF. Contrary to belief, running without it DOES NOT make the car run on retarded timing!!!

kopbet89c4

The TPS is all I need. No more, no less. It will be bad news bears when mine goes. I'm glad I have a spare one in my car.

tntcorvette

this is from another thread:



this 362 sbc put out more rear wheel torque than a stock tpi puts out at the flywheel.

Just food for thought.

5abivt

it's all sotp.

The long runners 'FEEL' like they have more torque down low because they have very bad high rpm torque/hp. A short runner manifold can 'feel' like its not pulling as hard because it makes a flat torque curve across the board.