Alfa 75 1.8 turbo for track day use only - Alfa Romeo Forum
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Alfa 75 1.8 turbo for track day use only

Hi guys...

I've recently brought an Alfa 75 turbo with the purpuse for using it only for track days.

I will do several mods to suspension, brakes, tyres, interior, exterior and... engine.

In this last part, my goal are near 300hp. Are the engine internals prepared to deal with that power? What turbo should i use to get there? Is there any other mods to do besides turbo, clutch, FMIC to have all that power reliable? I remember that is only for tracks days.

Thanks for your answers

Márcio
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You can not get 300 bhp out of that engine by just changing the turbo.
The factory group A engines used to produce about that and they were totally reworked.
A group N engine used to produce 200-220 depending on the restrictor size.
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Thanks for your answer.

With a new bigger turbo (what one?) and a proper remap what power could i get, without breaking the engine in two pieces?

Thanks
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Reliably no more than 220 on a standard engine.
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Out of interest what power is the 1.8T standard? Ive never looked into it but 220 seems a bit low if thats the upper level the standard engine can handle?
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Out of interest what power is the 1.8T standard?
I think it was only about 150bhp as std.
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Much lower than i expected! But then i may well be forgetting the age of the car here! After all a modern 3.0v6 would put out a lot more than the V6 in my 75 so it makes sense
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No. Actually it has 165hp. Mine is the QV version. There is a version with 155hp
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You still won't get 300bhp (or PS) from a std engine.
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You'd be able to get 300 no problem..... For a few minutes!

220 would be pretty swift in one however and plenty on track I'd say.

Quite a bit of info in 'the' twin cam book

I can get my twinny pretty scary with standard 140 - 150 (probably really closer to 100!) with full alfaholics suspension on it and 14 inch alloys! 300bhp must be a handful in a 75? Would like to experience it though
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What should i upgrade in internals? The engine has to be open for see if all internals are fine.

Should i upgrade the pistons or anything else? If do so, what pistons should i get (from where, brand...)?

Thanks
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Veloce Publishing

Try here first
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all well and good doing the engine, but the weak link is the gearbox and the rubber doughnuts......
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The rubber mounts will be upgrated by another ones in metalic compound. But, as they aren't to support huge loads of power, i think its not problematic.

About the gearbox, i have one other from an 75 3.0 V6 and if that one (in 1.8T) doesn't handle the power, i will put that one instead.

About the engine, what do you recomend for pistons? I've see ones in ebay (the brand is CPS) and they are at a good price. Also, they have ones witch are 81mm bore specific for this engine (i know that standard bore is 80mm).

There site: CPS - Costruzione Pistoni Speciali - Torino

Thanks

PS: marcevo1 thanks for the link. I've been reading some pages in google books and there is been very usefull
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Jim Kartalamakis is doing up his 75 1.8T. The stock liners are stronger than the 2.0L ones and can withstand higher boost pressures. I think he said high 200s is possible with stock pistons, but modified turbo, ecu, cams and some porting.
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Jim Kartalamakis is doing up his 75 1.8T. The stock liners are stronger than the 2.0L ones and can withstand higher boost pressures. I think he said high 200s is possible with stock pistons, but modified turbo, ecu, cams and some porting.

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I doubt standard pistons would last long at 250bhp upwards... Especially on a track car with prolonged boost. May be ok on a road car where you struggle to hold more than a fee seconds of overboost.

I'd imagine boost levels of 1.7 bar would be needed for those power outputs given relatively mild tune of everything else.

I ran a modified integrale with 280ish bhp estimated. Ported, manifolds, intercooler tilt mods etc - basically all the works group n 'cheats' combined with aggressive advance 1.7 bar map - very quick but only in short bursts.....anything above this was serious money for slight gain.

I can't see the alfa engine getting similar bhp without serious work on internals to be honest.

75 ts track car, 156 GTA Sport Wagon, 159 TI JTD 2.4 Q4 sportwagon (no more), 147 JTDm
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Jim K is not a nobody or a newbie(n00b) in the Alfa scene. Who is the author of "How to Power Tune Alfa Romeo Twincam Engines" ? Anyone want to take a guess? Right....

In fact according to him, my "high 200s" is very conservative.

I think I know why you are laughing, because I forgot about the upgraded intercooler and injectors right?

Have a look at high boost 1.8T in Greece with, according to him, stock pistons (but not stock everything else).

YouTube - Alfa 75 Turbo vs Ferrari Modena Spider
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I have seen 280hp on stock internals and stock turbo Changes were front mounted (and verry much larger) IC, ported head, different camshaft, remap (from squadra) and a better downpipe after the turbo (and a reworked exhaust)

At the time Squadra made a special chip for us, and yes the numbers come from the roling road, not from "adding bragging factors!"

The engine was built 10 yars ago, and as far as I know are still running well, but this has not seen track work.

Generally the 1,8 turbo engine is a verry strong engine, and can handle powers up to 400hp. albeit at expenses of longlivety.

A more modern turbo wil not realy gain you more HP, but you will get a more responsive engine with a larger usable RPM register.

166 2,4 JTD 1999
Alfetta 2,0 Rally 1974
Alfetta 2,0 1984 (Project)
75 2,0 carburator 1986 (Project)
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The prop shaft will need looking at for anything over 250bhp as more than that will chew the flex couplings. I saw Nick Humphrey's 500bhp 2 litre twin spark turbo. I think I recall he used some trick prop shafts from the US. He was also looking after an Alfa Corse car for someone else. I also recall someone doing a twin turbo GTV6 and it needed BMW box and shaft to take the power.
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reading this with interest,i've always fancied a alfa 75 turbo.Is there any for sale,and how many are there in the uk?
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Hi

These might interest you:-

http://www.alfa-pages.co.uk/Manuals/tb.zip

That is the Alfa 75 turbo booklet scanned in (small booklet in several langauges given to dealers, rather than a brochure).

http://www.alfa-pages.co.uk/Manuals/75telect.zip

Various specs for the 75 V6 and turbo (not in English).

Somewhere I have a colour brochure for the 75 turbo scanned in.

All the best

Keith
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Originally Posted by f1lmm View Post
reading this with interest,i've always fancied a alfa 75 turbo.Is there any for sale,and how many are there in the uk?
AforAlfa has got a black turbo. I think he is selling it.
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it will defo be a car on my list once i get through the alfa 155,the 131 abarth grp4,and tidying up the other 155.
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Hi All
I've just collected an America 1.8 turbo 75 today from a scrap yard in Exeter. Needs a fair bit of work to the body, usual rot in the usual places, and i believe the big ends have gone. But still very straight and a few goodies on it.

I'd be interested to know how many 1.8 turbo's there are in the UK.

Thanks

Dave
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