OK, NOW I KNOW IM NOT GETTIN' THE RIGHT AMOUNT OF POWER

[MTIDI]

Ok, now i know i am not getting **FIXED** owners of 93 & 94 IDI read this!!!

Got burned by a 91' IDI with a fresh pump, stock exhaust back till the rear of the cab, then into stacks. NO OTHER MODS. on take off, he was MUCH, MUCH quicker than me. i could keep up from 70-85 mph.

IP is turned up, smokes black until turbo gets some boost, then clears up.

I have a banks turbo, with the wastegate maxed.

I suspect it is the IP.

What should I do?

How quick do your turbo IDI's reach boost. Mine seems really slow.

brand new stage 1 injectors.

I don't have any experience with any other IDI's, as this is the first one i have ever been around.

SUCKS TO HAVE 3K IN A TRUCK, JUST TO GET BURNED BY SOME DUDE IN A STOCK ONE. :draw

help me out guys!!!!

 

[Agnem]

What about gearing? If he has 4.10's, and you have 3.55's that makes a difference. The rest of it I would say could be timing. Get your IP timed by somebody with the right equipment who knows how to use it.

 

[bikepilot]

Yep, gearing makes a huge difference off the line. I know when we got our 94 factory turbo the timing was way retarded and it was really slow. I'd expcet a 4.10 geared NA IDI to smoke a 3.55 factory turbo off the line. I had 4.10's in my factory turbo for quite a while, it would easily light up both rear tires - was quite quick off the line. I recently put in 3.55's and its not nearly as quick off the line, but is more relaxed at 75mph.

 

[MTIDI]

Nope, wasn't gearing.
I called Ken at DPS and was trying to figure out this issue, and after about 2 minutes, under the hood with cell phone at ear, we fixed it.

turns out, the 93 & 94 IDI's have a nice little screw on the back/top of the injection pump, facing the firewall. Ken called it a max fuel screw, and all you do is unscrew the white plastic cap, stick an allen key in it, and turn it out, then tighten the white cap again.

***HOLY COW!!!!***

Did it make a difference?!?!?! oh hell yes it did. I can't even explain what kind of difference it made.

The boost reachs max boost VERY, VERY quickly, which is now a beautiful, easy to obtain 12 lbs. the truck feels like it is on steroids. I seriously think it has more power than my cousin's 97 powerstroke----- same basic modes as me, but with an edge chip (obviously, when he is running his chip on high, he has way more power than me)

I was thinking of ditching the truck because of lack of power, but now i am definetally keeping her. I wish you all could see the smile on my face right now!!!!

 

[Darrin Tosh]

Sweet, Now maybee you can take that cummins comment out of your sig,...

 

[MTIDI]

Sweet, Now maybee you can take that cummins comment out of your sig,...

I dunno bout that

 

[Tristan]

So this little max fuel screw is only on the 93-94s?

I sure would like to find a screw like that on my truck

 

[MTIDI]

So this little max fuel screw is only on the 93-94s?

I sure would like to find a screw like that on my truck

yes, at least that is what ken at DPS told me. so i really don't know other than that.

 

[DeepRoots]

its the turbo IP.
I've got one on my 89

$350 for a rebuilt.... if you have a turbo, and you need an ip, it's the way to go... my truck is a pretty peppy piece of sh*t

 

[metrojd]

max fuel screw????

I thought I read somewere that that screw was for the max RPM?
What does your truck tack ou to now??
How much did you unscrew it??
Thanks
John

 

[MTIDI]

I thought I read somewere that that screw was for the max RPM?
What does your truck tack ou to now??
How much did you unscrew it??
Thanks
John

nope, maxes out at exactly the same RPMS as before, right at about 31-3200

 

[metrojd]

How much is enough???


Howmuch did you turn in?
It increased your boost?
Tell me Tell me Tell me !!!!!!
Thanks
John

 

[MTIDI]

Ok, fine. If I have to......

Howmuch did you turn in?
It increased your boost?
Tell me Tell me Tell me !!!!!!
Thanks
John

the screw it self is about inch and a half long-- i took it all the way out when messing around with it.

I ended up only turning it about a quarter inch- 3/8" out farther than it already was. it is now about in the middle of the screw, or maybe a little less.

I could acheive 12 lbs boost before i did this, but it was difficult. now i hit 12 lbs all the time. I stomp on it, and it shoots straight to 12 lbs. boost isn't slow to max out, it is quick. it feels much more like the diesels i have owned in the past, not the sluggish slow motor i was used to with the truck.

best thing to do is just start messing around with it. when you find a spot you like, red RTV around the set screw, then place the cap back on. otherwise, it will leak (at least mine did)