Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 944 Turbo and Turbo S

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
In the Fires of Hell.....
 
kdjones2000's Avatar
 
Join Date: Oct 2007
Location: Phoenix, AZ
Posts: 2,584
Garage
NA = Normally aspirated (ie: non-turbo).

Not sure if the Welts require a 3 bar fuel pressure regulator or not. Maybe someone else on here can chime in on that.

I would not trust a dealership to know much about these cars anymore, although I would be shocked if they didn't understand the risks of old timing belts. Your car has an interference engine, so if the timing belt slips/breaks, you are looking at a lot of bent valves.

The usual replacement cycle on these is 30000 miles or 5 years, just to be safe. If they get oil on them, they will degrade MUCH faster.

Lots and lots of threads on belts in the 944/951 forums here.

If you aren't going to be doing work on the car yourself, then your best bet is to find an old Por$che mechanic in your area who knows about these older cars and have them do the work. Keep in mind that unless your father in law replaced all of the vacuum lines under the intake manifold, those are likely very brittle and will need servicing soon.

This car will bleed you dry over the span of a couple of years just maintaining all of the stuff on it, if you aren't doing the work yourself, assuming that everything wasn't recently refreshed.

WG shims: Wastegate shims. Put in usually to help the wastegate be able to retain higher boost levels. Your Welts will push higher boost, so if you are not seeing your boost gauge pegged in 3rd gear, then you have some leakage somewhere, possibly the WG.

Cheers, Keith
__________________
'88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG
3300 lbs, 256 RWHP, 15 psig boost
"Certified National PCA Instructor" Hoooohah!
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
Old 03-09-2017, 04:07 AM
  Pelican Parts Technical Article Directory    Reply With Quote #21 (permalink)
Sponsor
 
Join Date: May 2014
Location: 155 Commerce Drive | Fort Washington, PA 19034
Posts: 80
Welcome Paul! Great looking 944T, very clean!

Let us know if there is anything that we can help with.
Old 03-09-2017, 10:45 AM
  Pelican Parts Technical Article Directory    Reply With Quote #22 (permalink)
Registered User
 
Join Date: Aug 2016
Location: Minnesota
Posts: 37
Garage
Thanks for the info!! I am looking forward to getting into the mechanics of the car and learn more about it. It would be nice to have a lift to do some of these repairs! I will probably have the belts replaced by a pro first time around. I will definitely ask about the WG and any vacuum lines that may need replacement. I feel comfortable around a good old big block but have never tinkered with a Porsche.....yet.
Old 03-09-2017, 05:16 PM
  Pelican Parts Technical Article Directory    Reply With Quote #23 (permalink)
Registered User
 
Join Date: Feb 2003
Location: East Bay
Posts: 1,424
Quote:
Originally Posted by PaulHunt View Post
KD It is a Weltmeister TC-8200 DME and KLR by Bosch. How would I know if it has a restrictor in the boost line? The best boost seems to come out of 3rd gear. Dumb question.... What is a NA car? I was looking through the service records and see that there has been some bodywork. That may explain the different emblems. Again, I can't ask the father in law.... Still going through the 2" stack of service records...
Quote:
Originally Posted by kdjones2000 View Post
NA = Normally aspirated (ie: non-turbo).

Not sure if the Welts require a 3 bar fuel pressure regulator or not. Maybe someone else on here can chime in on that.
The Weltmeister chips are most mild of all chip-kits with a bump to 13.5psi. It comes with two triangular wastegate shims of roughly ~3.0 and 1.0mm thickness so you can mix & match until you get up to 13.5psi in mid-range (3 possible max-boost values).

The chip-mapping are exactly the same as stock, cell-for-cell, just scaled up linearly. Raises redline to 6750rpms.

Doesn't use 3-bar FPR (or need one). That's partially to get by CARB's rules and to obtain CARB-EO # D-176-7.

No one ever re-sells these chips with the required wastegate-shims because they're a PIA to extract & install; requires disassembling the wastegate. That may be why this car has stock boost-levels, the wastegate does not have the required shims.

Don't trust the dash's boost-gauge. Check and verify that the boost-line going to the KLR is free of oil or crimps or leaks. Install an aftermarket gauge to be sure of exact boost-levels. You should be seeing max of 1.9bar boost that drops to 1.3-1.5bar levels by redline. Most likely your lower boost-levels (once confirmed with aftermarket gauge), is due to the collapsed and clogged exhaust-pipe section between turbo down-pipe and catalytic. Do the pinched-hose test and confirm CV, wastegate and exhaust condition.

Last edited by DannoXYZ; 03-13-2017 at 04:05 PM..
Old 03-13-2017, 10:01 AM
  Pelican Parts Technical Article Directory    Reply With Quote #24 (permalink)
Registered User
 
Join Date: Apr 2017
Location: Cordell Oklahoma
Posts: 2
DannoXYZ, I just picked up an 86 951 last weekend and the PO installed a Lindsey dual port boost controller. He informed me that it had just recently been done and it was not set correctly yet, it was set with the pressure to high. I have been taking it down and am at about 13 psi right now. So if I read this correctly at anything over stock boost the engine will start running lean, is this correct? Therefore to run more boost I will need to find a chip to richen the engine at higher boost levels lest I melt her down. My actual question is what should the stock boost level be? Is it as I have read here and there at around 11 psi?

Thanks for any insight you can give me I would appreciate it.
Old 04-13-2017, 05:14 PM
  Pelican Parts Technical Article Directory    Reply With Quote #25 (permalink)
In the Fires of Hell.....
 
kdjones2000's Avatar
 
Join Date: Oct 2007
Location: Phoenix, AZ
Posts: 2,584
Garage
10 psi is stock boost.

You will likely need to get a 3 bar FPR as well in order to be able to support significantly higher boost levels. What you need will really depend on the chip(s) you choose.
__________________
'88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG
3300 lbs, 256 RWHP, 15 psig boost
"Certified National PCA Instructor" Hoooohah!
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
Old 04-13-2017, 06:57 PM
  Pelican Parts Technical Article Directory    Reply With Quote #26 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Registered User
 
Join Date: Feb 2003
Location: East Bay
Posts: 1,424
Quote:
Originally Posted by jackal99 View Post
DannoXYZ, I just picked up an 86 951 last weekend and the PO installed a Lindsey dual port boost controller. He informed me that it had just recently been done and it was not set correctly yet, it was set with the pressure to high. I have been taking it down and am at about 13 psi right now. So if I read this correctly at anything over stock boost the engine will start running lean, is this correct? Therefore to run more boost I will need to find a chip to richen the engine at higher boost levels lest I melt her down. My actual question is what should the stock boost level be? Is it as I have read here and there at around 11 psi?

Thanks for any insight you can give me I would appreciate it.
It's not just max-boost you want to be concerned with, but boost at each RPM-point under full-throttle. Factory '86 951 has something like this:

3000rpm = 8psi
4000rpm =10psi
5000rpm = 8psi
6000rpm = 7psi

The issue with using anything other than stock boost-control devices is that the boost-curve no longer matches what the chip's fuel & ignition maps are programmed for. You've got some potential to blow up engine here depending upon what your actual high-RPM boost-levels are.

Last edited by DannoXYZ; 04-16-2017 at 08:12 PM..
Old 04-16-2017, 08:08 PM
  Pelican Parts Technical Article Directory    Reply With Quote #27 (permalink)
Registered User
 
Join Date: Aug 2016
Location: Minnesota
Posts: 37
Garage
Good info!! I am taking our car in on Wed. to get the belts done and to have them do a dyno and tune. $$$$$
Old 04-17-2017, 06:45 PM
  Pelican Parts Technical Article Directory    Reply With Quote #28 (permalink)
Registered User
 
Join Date: Feb 2003
Location: East Bay
Posts: 1,424
I would hold off tuning until you have some way of programming the fuel & ignition maps on the chips. Otherwise you'll just get a dyno-chart with power, torque and AFR with no way to precisely adjust it. Rogue Tuning site has info on software you can download to program chips. Easier to get the Rogue M-Tune with PC-programmability and no need to swap chips.
Old 04-18-2017, 09:23 AM
  Pelican Parts Technical Article Directory    Reply With Quote #29 (permalink)
Registered User
 
Join Date: Aug 2016
Location: Minnesota
Posts: 37
Garage
Thanks for the advice... Looking into it now.
Old 04-18-2017, 04:32 PM
  Pelican Parts Technical Article Directory    Reply With Quote #30 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 03:25 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2016 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.