I have a 1951 Ford with a 400 small block and a 85 tune port on top of it. I had a shop build a 700r4 for it and i put it in. The car doesn't shift right or have much power. I took it to 3 other transmission shops and they all said the same thing. the motor is not pulling through to make the tranny shift correctly. when the car is going down the road and you put it to the floor the motor will start to crack up. all three shops said they could not tell if it is a spark problem or a fuel problem.. I am suspecting fuel problem.. One shop wants me to ask if it is ok to have the fuel pump outside the tank?? and where should i start. I have all of moates tunning devices to make changes.
Trever

 

I would suggest that you start by checking fuel pressure first at the shrader valve, and also checking the timing. What king of a cam do you have in that engine? It could be possible that the cam may not be compatible with the TPI.

 

What program did you put into the computer to start off with and have you done any fuel corrections? Might be time to invest in a WBO2 setup, kind of suspecting your engines computer is not giving enough fuel. Also this tranny problem does it only happen when you try to step on it not when your just doing normal driving?

Might help if you can list more of your setup, wouldn't mind knowing what size injectors your running.

 

Hey guys thanks for replying. First I want to let you know I am knew a tuning and am a body man by trade so bare with me. I just put aluminum heads and a fuel injection cam in the car for tune ports because I had too much compression and your right a monster cam in the car(old school) I don't have the specs on the cam but will get them for you. The local machine shop looked everything up for me and got me the correct cam. fuel pressure at the schrader valve is around 43 psi???? is that good. I don't know how big the injectors are but they are bigger than factory. They are blue in color??? maybe ford svo injectors??? Yes I took the car to a car show in minesota this weekend about 5 hrs away and it goes down the interstate fine. I just don't make any real power when you want to stomp it to the floor and both tranny guys at different shops said the motor is breaking up and not letting the tranny shift when you get the motor wound up. Since last night I have burned a Street and Performance chip and it seemed to be a lot better.

 

The s&p chip i burned i got from someone named ed that logs on here??? I changed the cylinder volume to 400 small block and changed the injector rate to 24??? and i shut the egr off because i am not running one. These changes made a difference so i think i am on the right track???? the engine will still break up and lose power when the rpms get up there? what you think???

 

Think we need to find out what injector your running Do they look like the ones in the link? http://store.summitracing.com/partde...5&autoview=sku

Also 43psi is fine for fuel pressure but does it drop when you step on it? I usually tape the guage to the window and go for a drive, pretty easy to check it like that.

Looks like your going to have to do lot of researching on how to tune you engine, hit up the guys on the DIY PROM part of the board see if they can help you some or get in contact Ed.

 

are you running a stop tuned port setup? if you are, that is not meant for your 400 block, it is meant for a 305. even the stock tpi setup on a 350 will fall on its face after 4,700 rpm's. and by that math, your 400 is going to fall on its face around 4,100 rpm. you might want to look into alternate intake systems if you plan on any higher rpm than that, which i assume you are since you installed bigger heads and cam and moved your powerband up.

 

what kind of alternative intake are you talking about?? just bigger runners and bigger throttle body? Or are you suggesting scrapping the entire tuned port???

 

its totally up to you. if you like the style of the tpi system like some do, then at least get some large tube or siamesed runners and match the plenum to them, also get the edelbrock base manifold to go with it, that should get you a bit higher in the rpm, but not very much. i run the accel super ram on my 383 stroker and its supposed to make power up to 5,200 rpm. for you engine i would suggest looking into either the holley stealth ram or the tpis miniram. check out the link below, its a sticky in the Alternative Port EFI Intake forum about all the different available systems with a wealth of info on them.

https://www.thirdgen.org/forums/alte...nversions.html

 

You cannot say just because the engine is X amount larger it will fall off at X rpm. While it is true the TPI setup is optimized for a 305, it does not mean that it will fall over at 4,100 rpm on a 350. I have seen dyno's of mild 383s where the power just flattens out, but hangs on till almost 6,000 rpm. With the cammed vortec head 305 in my Van running on teh stock runners, I had it to 6,500 rpm on a few occasions. It was still pulling there.

 

flatens out or falls on its face whatever you want to call it, its not going to make any more power past that rpm, its what i meant. and i know there are more parameters to when the rpm band is going to not make more power, its was just an example. a bigger engine is always going to pull more air than a smaller engine at the same speed, so with a 350 flatening out at 4,700 rpm which has been proven with the tpi setup, on a larger engine with the same intake setup its going to flaten out at a lower rpm, i was just estimating on his 400 engine that it wont go any higher than 4,100. I didn't want to get all technical on this thread, i just wanted to point him in the correct direction of going with a better flowing intake, cause its obvious its the tpi intake thats holding him back.

 

My point is its NOT the TPI intake that is holding him back from his transmission upshifting. PERIOD, end of story. Its something else with either the fuel, the timing, or the tuning. The TPI intake runners can flow, but they are very long. That makes them resonance bound to about 4,600 rpm for peak HP and 3,200 rpm for peak torque. The resonance is the reason for the peak. Ever notice with the stock LTR TPI intakes, the same exhaust, same head design, same camshaft, the 305 and 350 TPI peak at the same exact RPM for both peak HP and peak torque.

 

Ya I have to agree with you. Yes I have been reading for the past few days and the tuned port will run out of power at certain rpms but it should still have enough to pull the 700r4 through the gears. two different tranny shops said the motor is breaking up and sounds like it is running out of fuel or spark before it is allowed to shift. I have been doing some reading on the upper and lower ve tables and starting to do some recording from my snap on solus pro. I really think the motor wants more fuel.

 

also I read one article about getting the blm to read 128 at all different points. is the lower ve table a good way to start?

Also what other triggers should I look for on my scanner? What other PIDs should I look at to my dial in on where the car is failing.
Trever