Alfa 156 V6 3.0 Supercharged - Alfa Romeo Forum
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Tuning & Upgrades Discuss performance enhancements for your Alfa Romeo

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  • 4 Post By tammina
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(Post Link) post #1 of 12 Old 02-12-18 Thread Starter
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Alfa 156 V6 3.0 Supercharged

Hi!

Check out this video - supercharging my Alfa 156.


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Great project and video
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Last edited by crossshot; 04-12-18 at 08:33.
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Great work. What diameter exhaust are you using? That downpipe didn't look very good quality. Ideally you should use a pair of separate downpipes with twin flexis, so you're not pushing more gas through the flexi than it is designed to cope with. Your manifold outlets are 50.8mm ID so a pair of downpipes built from 54mm tube (2 & 1/8th inch tube, which is 50.8mm ID also), then collect them into 70mm exhaust tubing (2 & 3/4 inch, approx 67.5mm ID) is what I would recommend in your situation. Even 70mm exhaust tube has slightly less flow than 2 x 50.8mm, you could try and go up to 75mm but I think any more than that and you'll struggle to get it over the rear subframe. You look like you have the skills to do it anyway
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(Post Link) post #4 of 12 Old 03-12-18 Thread Starter
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Thanks guys! It was fun to make that video, some kind of therapy too. Yes, quite suprise that mess in flexi. Don' t know when that happened… 2.5" exhaust and a standard downpipe. Still have some problems with motor overheating on track so before next season we have to fix this exhaust case, too. Thanks for your suggestions.
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Amazing
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Quote:
Originally Posted by tammina View Post
Thanks guys! It was fun to make that video, some kind of therapy too. Yes, quite suprise that mess in flexi. Don' t know when that happened… 2.5" exhaust and a standard downpipe. Still have some problems with motor overheating on track so before next season we have to fix this exhaust case, too. Thanks for your suggestions.
Yes thats what happens with those flexis when there is too much gas coming through. Twin downpipes like a GTA would be better for your car. Looks like you could quite easily make some yourself but if you prefer my company sells them to fit your manifolds.

Do you still use the 2.5 V6 oil/coolant heat exchanger? This might contribute to high coolant temperatures. Its very near to the exhaust too.
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(Post Link) post #7 of 12 Old 04-12-18 Thread Starter
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Yes, standard heat exchanger. Please feel free to offer your downpipes, PM or so.
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Your account on here is too new to receive PMs, but if you could email me [email protected] or send a message on our FB page that would be great, let me know delivery postcode in Finland and I'll find you a delivered price: www.facebook.com/WizardExhausts
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Very cool.....but I was kind of expecting rather bigger numbers....especially torque. 400 nm does not seem like a lot for a blown 3.0. My 2.0 JTDM produces 420Nm and that's with a very mild map. And Im sure there must be lots more power to come. Seemed like a hell of a lot of work for a 300 horse motor to me. A 3.2 GTA would have given a 250 starting point with no mods. Cool project with great engineering though.
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It doesn't make any sense comparing torque figures in diesel vs. petrol engines
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(Post Link) post #11 of 12 Old 05-12-18 Thread Starter
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We have done nearly every mistake you can imagine with this project… but I'm not the one who give up.
I think 400Nm is quite ok and enough for me. There was 300HP with 0.3bar but I now use 0.4-0.5 bar so there's more power..
If I can reduce still fairly high temps with better exhaust or so, 350HP is the fact. Without Rotrex the car was a perfect time attack
car, now over 300HP there's some work to do with chassis. Also.

Last edited by tammina; 05-12-18 at 15:28.
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(Post Link) post #12 of 12 Old 06-12-18 Thread Starter
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One thing that doesn't appear in the video:
I use 70mm pulley wheel with Rotrex. Because C30-94 max rpm is 100 000, the max motor rpm should not go (too much) over 6500 with that pulley.
I have found out 6500 is enough and maybe safer when used standard pistons. A small pulley wheel gives easily torque to mid register and it's good on track - our tracks here are quite short (no long straights) and curvy.
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