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sira · Post by **sira** » Mon Mar 20, 2006 8:59 pm

I want to supercharge my Twin Spark but I don't know much about it, what supercharger to use, how much psi if engine is total stock, and will it work with stock Motronic 4.1 on low boost?

Thanks

P.S. I can see how people with experience roll their eyes after my question.

GTV6GPTT · Post by **GTV6GPTT** » Wed Mar 22, 2006 8:27 am

stupid idea. dont waste ur time

find a TS turbo engine and drop it in.

sira · Post by **sira** » Wed Mar 22, 2006 12:49 pm

Turbo TS engine???
Alfa never produce that engine.

SydneyJules · Post by **SydneyJules** » Wed Mar 22, 2006 5:01 pm

no they didnt.

But I agree with him when it comes to smaller capacity engines, supercharging is a bit of a waste- you're losing torque to gain it. It's different when it comes to a v6 because the pipework and outlay for one big turbo isnt easy, and the outlay for two of everything with a twin turbo is a bit more again. A properly sized turbo conversion is going to give you much more for your money- and with a TS, you dont need to change the plenum chamber if you dont want to. If you wanted to do a real budget performance conversion you could grab a GT28 off a nissan SR20, construct pipework out of steam pipe, grab the intercooler off a factory turbo car (again, a nissan SR20), and put 15psi into it with aftermarket injection (again- Ems is cheap). You could still get 150kw ATW... which is more than my almost full race 2.5 V6 makes.

ar4me · Post by **ar4me** » Wed Mar 22, 2006 5:46 pm

I have a friend who runs a supercharged 2.0 TS (the good old 8 valve) in an Alfetta GTV. With stock engine I believe it made 240 HP safely at the wheels - with 0.6 bar, if I recall correctly. The set-up looks factory - very nicely done. He is using the Rotrex supercharger. Last summer when I visited DK he started it up first time with a rebuilt engine (lower compression to allow more boost). It works very well. Don't know of any dyno numbers for the rebuilt lower compression engine. Though, I have the start-up on video. Hardly qualifies as stupid.
Jes

SydneyJules · Post by **SydneyJules** » Wed Mar 22, 2006 7:20 pm

Hi Jes,

Yeah, Its a good result, and is probably a cheaper-to-do conversion, but Ive been in supercharged Alfa, BMW (OK it was a 323), and a Nissan (FJ20) four cylinders... the turbos kick their arses on less boost, everytime.

MD · Post by MD » Wed Mar 29, 2006 3:31 am

for all you pump heads

http://www.rbracing-rsr.com/turbotech.html

sira · Post by **sira** » Mon Jun 05, 2006 7:18 pm

My idea is build in eaton M62, intercooler and dastek unichip piggy back computer.

Alfa 8V TS engine specification:

No. of cylinders,layout 4, lengthwise at front
Bore x Stroke [mm] 84 x 88.5
Displacement [cc] 1962
Compression ratio 10:1
Max. power output BHP-DIN [kW-EEC] 148 [107]
at 5800
Max. torque mkg-DIN [Nm-EEC] from 16 [157] to 19 [186]
at between 2000 and 4000

Engine - Construction
Timing [control] DOHC [chain], variable advance
Fuel feed Bosch ML-4.1 Motronic electronic injection integrated with ignition

Some informations from autocomponenti:

Here's a chart for anyone considering the building of a turbo or supercharged Alfa Romeo engine. Use it to calculate the effective compression ratio from static compression ratio and boost level. The example shows the effect of running 15 psi boost in an engine with a 7.8:1 static compression ratio. With a good intercooler and slightly rich mixture, effective compression ratios up to 10.5:1 can be successfully run on premium unleaded gasoline in a single-plug engine, and up to 11.0:1 in a twinspark engine.

sira · Post by **sira** » Mon Jun 05, 2006 7:19 pm

My conclusions at this moment are:
i will get 200-210 ks with 320 CFM, this is on 10000 rev of charger, diametar of pulley must be 100/58*diametar of crank pulley.
i must use intercooler becouse delta temperature 90 degree Fahrenheit is too mush for me

But I have some questions:

1. How regulate boost, I want 5 PSI?
2. Which injectors i must use?
3. Am I boring?
_________________

Greg Gordon · Post by **Greg Gordon** » Mon Jun 05, 2006 11:43 pm

removed

Mats · Post by **Mats** » Tue Jun 06, 2006 1:53 am

So what is it like to have a huge mass coupled to the engine, is it like a super heavy flywheel?

Greg Gordon · Post by **Greg Gordon** » Tue Jun 06, 2006 6:47 am

You can't even tell it's connected if it's off boost. The rotors are alloy and have a diameter of about 2 inches. It's not at all like a big heavy flywheel. With the supercharger locked into off boost mode (ie. spinning but not providing boost) you can't notice any difference in engine response.

I suppose with some ancient blowers mass might be a factor, but with modern units it's not. Roots superchargers have come a long way, just like Turbos. These criticizms are usually based on outdated information. Sort of like basing turbo experience off of a 1965 Corvair Turbo.

Mats · Post by **Mats** » Tue Jun 06, 2006 10:54 am

Well, I have about zero experience of superchargers so I was just wondering.

Greg Gordon · Post by **Greg Gordon** » Tue Jun 06, 2006 12:17 pm

Well go get one of those European market only Eaton mini blowers (like 22 cubic inches) and bolt in on in line with your turbo.

sira · Post by **sira** » Tue Jun 06, 2006 3:10 pm

This Eaton supercharger from is Mercedes Benz (i think they use it on CLK 1800 ccm) so I dont think that he is too big for my engine, but I have to find more reliable maps.

How to supercharge 2.0 T.S.?