BucketTrucker688 Posted July 10, 2018 Share Posted July 10, 2018 (edited) Would a Borg Warner S400G073 turbo be too much for a E7-350 to handle? The motor is not turned up at all and has all it's oem parts. There is one for sale locally to me brand new but don't know if it will do me any good. I'm starting to see some oil residue on my v-clamp on my turbo outlet so thinking it may be time. Currently it has a S3a038 turbo on it now. Truck runs good but still seems like it could do better. Edited July 10, 2018 by jakehaab Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/ Share on other sites More sharing options...
OldRedMack Posted July 10, 2018 Share Posted July 10, 2018 If it is a good deal, I would buy it and put it on. Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402239 Share on other sites More sharing options...
BucketTrucker688 Posted July 11, 2018 Author Share Posted July 11, 2018 If $800 is a good deal or not idk...its probably $1300 or more from mack Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402260 Share on other sites More sharing options...
TimberJack Posted July 11, 2018 Share Posted July 11, 2018 I’ve got a s400 for a 60 series Detroit on my E7 with stage 2 injectors. Does great. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402288 Share on other sites More sharing options...
AZB755V8 Posted July 11, 2018 Share Posted July 11, 2018 9 hours ago, jakehaab said: If $800 is a good deal or not idk...its probably $1300 or more from mack If that is the price that turbo can be purchased new from a speed shop for that. Chances are the exhaust housing will need changed to work on a diesel. Checking on Jegs Speed Shops the housing are about $170. The reason for a change will be when you want to start making boost. The smaller the A/R number the lower the RPM's to spool the turbo. Other thing is the amount of boost, these turbos will make 50PSI Plus with no issues. Injectors and pump need to be worked on for flow and timing to balance the increase in air going though the engine. If you have emissions testing I would not do it. With added PSI everything else need to be looked at. It is not as simple as bolting a big PSI turbo on and go like hell. Head bolts, couplings and gaskets seem to snap or fail at elevated boost pressures. Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402297 Share on other sites More sharing options...
880joe Posted July 12, 2018 Share Posted July 12, 2018 What is part number of the s400 Detroit turbo your running with the stage 2 injectors Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402312 Share on other sites More sharing options...
fullfuel01 Posted July 12, 2018 Share Posted July 12, 2018 i run a detroit turbo on a etech an its not working good. too big. Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402338 Share on other sites More sharing options...
880joe Posted July 12, 2018 Share Posted July 12, 2018 Are you running stock injectors or upgraded one's on the etech Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402346 Share on other sites More sharing options...
fullfuel01 Posted July 14, 2018 Share Posted July 14, 2018 I had upgraded one but i could ear a bad bark like a miss on pulling. i got all 6 out and pop tested, 3 had a bad spray. sent them to the injection shop and they told me they are cook! sent me stock injector back. I was pissed. So now i can hardly get 25 pound of boost and it's still a lazy 350. I am trying to get modified EUP so they give more fuel without the computer knowing it, basically it's like turning the rack on any old Mack mecanical engine. No chances so far.. Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402397 Share on other sites More sharing options...
Jamkar Posted July 15, 2018 Share Posted July 15, 2018 I'm wondering which E7 you have Timberjack? What HP was it set at before and how are all your temps and fuel use affected? Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402416 Share on other sites More sharing options...
880joe Posted July 15, 2018 Share Posted July 15, 2018 It was my understanding that the eup's put out plenty of fuel needed bigger injectors to get more fuel that you can only push x amount of fuel through stock injectors. Correct me if that's not right Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402419 Share on other sites More sharing options...
fullfuel01 Posted July 15, 2018 Share Posted July 15, 2018 you are right, they have capacity to supply more then enuff of fuel but they dont because the ecm is program to send a certain amount of fuel. If I could find a programation that allow a bit more fuel on each pulse, I'll be ok. This seems to be impossible, so I want EUP that will allow more fuel to be delivered to the injector. It is the exact same thing of when you turn the rack on an old Robert bosch pump. You didnt had to change the injector on an E6 to make it go, we just added fuel to the injector. Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402452 Share on other sites More sharing options...
TimberJack Posted July 15, 2018 Share Posted July 15, 2018 (S400) # 23504966. I put stage 2 injectors and mine runs like a different truck. I tried stage 3 but was to much heated up to quick. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402461 Share on other sites More sharing options...
TimberJack Posted July 15, 2018 Share Posted July 15, 2018 2003 427, if you stay with the stage 2 you will be fine. Mine preforms best around 1400-1600 rpm Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-402462 Share on other sites More sharing options...
BottleHauler84 Posted August 30 Share Posted August 30 On 7/15/2018 at 4:00 PM, TimberJack said: (S400) # 23504966. I put stage 2 injectors and mine runs like a different truck. I tried stage 3 but was to much heated up to quick. I was thinking of going this route on my vmac1 E7. What year if you E7 with the BW s400 on it? Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-557828 Share on other sites More sharing options...
Joey Mack Posted September 1 Share Posted September 1 Bottle hauler,, not tryin to bust your Ball$, but its too is an old post. Do you want to start your own thread? It will get better resullts.. I have books on your engine, and can post Mack spec sheets for you, if that will help.. I suggest a new thread.. Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53768-s400-turbo-too-big-for-1991-e7-350/#findComment-557876 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.