Im looking at buying a GTI-6.My previous car was a throttlebodied saxo VTS.

I realise the performance wont be close to that of my saxo. I was wanting to cam and throttlebody the GTI but since reading through the site I realise the pistons have to be changed to run wildish cams. so my question is what is the wildest cam that can be run on standard pistons and what sort of power will this give.

Cheers for any help

mine has race cams in! and runs fine. i have been told to get the head ported aswell! which i will be doing!

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Team Black Rallye
xbox live - Xx 7 kenny 7 xX

My saxo was very peaky.no power below 3k revs and peak power at 7.6k so I wouldnt mind losing some low range on the GTI as Im used to it.getting the head sorted is a good idea though. QEP did my old head.

What cams are you running ken?

not race cams, fast road probably. You can see 200hp with a set of 270s and head with maniflow manifold. With throttle bodies say 210-220hp. Doesnt cost alot to pocket the pistons tho

You're dreaming. The head already flows more than most "ported" other make heads. The limitation are the small camshafts.

You can run up to approx. 0.060" lift at TDC before entering the danger zone.

amusing "race cams" comments and "get it ported"

re; clearance in the stock engine, there's no way race cams will fit in there without larger cutouts and often machining to the head for lobe clearance.

scary/informative thread linky

you'll get around 167=190 odd on the stock inlet with some cams SAFELY if you want nearer 200 you'll need the pistons modifying or different ones.

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need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

"First off I'd suggest don't waste your money on aftermarket exhaust systems - the standard item is very good - save the money and spend it on cylinder head mods which will increase power throughout the range. As with other engines the trick is to get as much cylinder head flow as you can and then use as little cam as you need to avoid losing low rpm power." David Baker of Puma Race engines writing about the Mi16 engine.

scary isn't it, just imagine how many potential tappers/valve droppers are out there, especially if the heads are skimmed too much!



oh dear you didn't read what was posted above by a reputable engine builder then...




also, whilst bob is correct that the gti6 isn't an Mi16 engine, they flow just as well out of the box, most XU 16v heads will work well enough for mid 200's + without any work to them.

the key is the cams and bottom end.

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need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

I have got Kent PT80's in mine, the only other mods are Lightened Billet flywheel and crank pulley and a K&N. Standard exhaust/CAT and it made 180bhp when mapped with a lot better Torque curve, especially after 4000RPM. I was told at the time tht the PT80's (which are a fast road cam) were as lary as you can go without having to look at lifters etc due to clearance (if you wanted a proper job anyway)... HTH

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Almost standard 1999 Bianca Rallye
Hilux InvincibleX daily

306 No.13

Carp and specialist Anglers Click here

Brett Simms (Longmans engine builder) told me this week that you can flow up to 280 bhp on standard size valves (they did) admittedly, rpm was circa 9K but it's possible. As for porting, he said just match the inlet manifolds and smooth the rough casting marks and leave the shape of the ports well alone, Peugeot did a pretty good job of the head already.

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R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars

PSA would never have tested the engine in BHP- an out of date unit. The engine we have is 122kw when new. After 250k miles there would have been significant wear. If you test the compression of an engine when new and then when its done 100k miles you will notice the compression is lower and therefore it is not possible for an engine to develop the original power figure. If the 250k engine made the same power as a new engine it would mean no engine wear had taken place, that is impossible.

The ONLY means of measuring the output of an engine is via an engine dyno. RR values should be used for relative comparison only- ie take a reading before and after modification to see if it has made any difference. You can only guess at the flywheel power from a measure of brake power at the wheels. I guess a new standard engine should make about 135-140 at the wheels. I plan on having mine on a power run to see how far off original performance it is.

PS as a unit rendered obsolete in 1992 by directives though so that leaves only KW.

What BHP at the wheels figures have people achieved with standard engines?

Compression decreases decreases with mileage, i therefore have to conclude they produce less power as a result. How else do you get power to the crank?
Manufacturer power figures will be calculated with a perfect engine in a lab in ideal conditions with a all perfectly run in parts and new exhaust and lab spec fuel (prob 100RON). You cant possibly expect a 100k mile engine to produce that can you?

You speak of these old engines producing the original claimed power but how do you know if they do without removing them to test.

On one trip to a rolling road I ran in 3rd gear then 4th then 5th- all gave a different
figures! Completely meaningless values- according to the machine the transmission losses were different each time!

I used to have a mk2 16 golf- a car people say gets better with age etc and can produce original power. Hmm, high lift cams, vernier pulley, new seals fuel pump genuine exhaust etc etc with 75k on the clock still only made 122 at the wheels- ie 140bhp fly. VW technical states power losses via transmission is 15%. Original claimed figure in magazines etc 139bhp (actual figure 102kw a bit less than 137bhp or 139PS).