Converting turbo to turbo s

[pozican]

Which turbo / chip do you buy?

I guess just the OEM turbo and chip for a turbo S?

Is there anything else you would need?


I also heard there is a turbo upgrade + chip to get you 125hp above turbo S -- Which turbo + chip is that?


Don't need more power, but I wouldn't complain

Thanks,
-Alex

[lleroyb]

Vitesse is your friend. Don't stop at a stock Turbo S config. besides it would probably be cheaper to go with a Vitesse turbo than a stock Turbo S turbocharger. If my stock turbo were to explode I would look real hard at a Vitesse stage II.

[pozican]

Originally posted by lleroyb
Vitesse is your friend. Don't stop at a stock Turbo S config. besides it would probably be cheaper to go with a Vitesse turbo than a stock Turbo S turbocharger. If my stock turbo were to explode I would look real hard at a Vitesse stage II.

I'll look into that.
I'm sure it has a matching ECU?

Will I need to do piston upgrades or anything?

Thanks,
I'll look around for it
-Alex

[thedge]

Originally posted by pozican
I'll look into that.
I'm sure it has a matching ECU?

Will I need to do piston upgrades or anything?

Thanks,
I'll look around for it
-Alex

http://www.vitesseracing.com/html/stage_ii.html

The full kits come with chips, MAF, piggyback for tuning, etc. Everything thats needed.

[ae1969]

No internal upgrades necessary for vitesse.........

I would recommend a better waste gate and bov.......

Otherwise it is all plug and play.

......and John is an extremely helpfull guy.

[SD Porsche Fan]

From Clark's Garage

"The Turbo S received the M 44.52 engine as opposed to the M 44.51 engine of the earlier models. The engine itself remained essentially unchanged from the early 1988 models. However, the turbocharger was changed to a K-26#8. The Turbo S was electronically limited to the same maximum boost (1.75 bar) as the early 944 Turbos. Also both models achieve maximum boost at approximately 3000 rpm. However, the K-26#8 turbocharger was capable of maintaining maximum boost until 5800 rpm while the boost on the early turbos would decrease from 1.75 bar at 3000 rpm to 1.52 bar at 5800 rpm. This resulted in a 30 hp increase in peak horsepower and a 15 ft-lb. Increase in peak torque.

The Turbo S transaxle came standard with a limited slip differential. However, there were improvements to the differential over previous models. The Turbo S differentials have inner plates which are 2.5 mm thick as opposed to 2.0 mm on earlier models. This required the two differential thrust rings to be made 0.5 mm thinner for the same overall thickness. Also, the inner plate and differential shafts are molybdenum coated for additional hardness. The clutch had a two-stage torsional spring damper with the friction material being bonded and riveted to the clutch disc instead of just rivets on earlier models.

The wheels on the Turbos were milled forged 7J x 16 in front and 9J x 16 in the rear (52.3 mm offset). The tires were 225/50 VR 16s in front and 245/45 VR 16s in the rear. The M 030 suspension package was standard equipment on the Turbo S models as well as ABS."

Also consider that the Turbo S had hardened 1st and 2nd gears to accomidate the additional power. Your 86 also has different offsets so that may limit your rim choices. The "S" also had rolled fenders to accomidate larger wheels.

[AaronM]

Originally posted by SD Porsche Fan
Also consider that the Turbo S had hardened 1st and 2nd gears to accomidate the additional power. Your 86 also has different offsets so that may limit your rim choices. The "S" also had rolled fenders to accomidate larger wheels.
[/B]

I've never heard of transaxle issues even on non-S cars, I do not believe that to be an issue at all.

The S's wheels, while wider, were the same diameter, and I am currently running tires with the same width as S-spec on my '86 without any rubbing issues.

[87944turbo]

You may want to check this out (http://www.lindseyracing.com/129876543/0906.htm). Look for the shop talk section.

[pozican]

Originally posted by ae1969
No internal upgrades necessary for vitesse.........

I would recommend a better waste gate and bov.......

Otherwise it is all plug and play.

......and John is an extremely helpfull guy.

I read on vitesse's site that 55lb injectors were required. Do 951s have those stock?


The 951Max chips looking amazing...

I'm a little worried as to reliability...
I already have the lindsey boost enhancer, 3" exhaust, so if I got some wastegate shims and 3 bar fuel pressure regulator I would be golden...
How long would it last though? I'd be scared at that high of boost, and I'd really want a boost controller, so I could turn it back down...

Suggustions? Comments?
Thanks!
-Alex

[87944turbo]

Porsche did not supply 55lb injectors with the K26/8.

I am using the stock Bosch injectors with the 951MAX chips for the 15-18psi range. I basically have the same setup your are talking about. My car is an 87 with a K26/8 installed with a 3bar FPR. I am also using an EBC and a Tial wastegate, but these are not a requirement. 55s might be necessary if you plan on running a really high level of boost. Russell at 951MAX will be able to tell you exactly what you need. The Lindsey car was running stock injectors as well from what I remember.

What level of boost do you plan to run? You might want to consider using an MBC. There are some really good ones out there for ~ $50.00. And of course a good aftermarket boost guage, if you don't have one already.

[pozican]

The previous owner installed a boost gauge - It's an Autometer?
I dunno looks really ricey -- Dunno if it's any good.

How reliable is your car with the 951MAX chip?

How rich is it running?

Did you go through emissions?

[87944turbo]

The car runs well with the chips. I don't have my WB installed yet, but I have not had any symptoms of running lean (detonation) or rich (black smoke). Fortunately there are no emissions testing in this state, so my car is catless and has WG that dumps to atmosphere.