Nitrous

[marT350T]

I have a 1.8t 20v turbo engined car which is modified with and IHI turbo and runs about 18 psi on full chat. I am looking to add a little nitrous to it ( probabaly 25 hp jets ) just to get the turbo to spool up quicker.
The problem is I think my engine only has standard internals , will they cope ?

I also run water injection and its charged cooled if that makes any difference.

Thanks

[LaSarthe&Back]

350bhp is about the most thestandard internals will reliably handle.

Some have been known to snap a rod or two though!!

[obes]

hmmm, I've heard that 330-350 is about max too.
as mentioned, the problem is that if there is a failure it won't be a little one, it may well chuck a rod through the block...ouch!

Always worth remembering there's a lot more to performance than power. If it's more speed you're after it may well be worth throwing some cash at getting the weight down. It'll make a huge difference to the the way it gos !

[marT350T]

obes said:

hmmm, I've heard that 330-350 is about max too.
as mentioned, the problem is that if there is a failure it won't be a little one, it may well chuck a rod through the block...ouch!

Always worth remembering there's a lot more to performance than power. If it's more speed you're after it may well be worth throwing some cash at getting the weight down. It'll make a huge difference to the the way it gos !

Yeah I have already gone down that route. This engine mentioned above is sat in the middle of a mk3 polo coupe that has been fully stripped out and only ways approx 820 kg !!

I have been thinking about replacing the rods and pistons, excluding the price of the bits how much / how long would it take to upgrade these items.

[obes]

marT350T said:

Yeah I have already gone down that route. This engine mentioned above is sat in the middle of a mk3 polo coupe that has been fully stripped out and only ways approx 820 kg !!

nice! like the sound of that !

No idea on the rods and pistons mate, you should be able to google up a few specialists who could sort you out. Can't help thiking you'd end up having to do more and more work than just the rods and pistons though. I know a couple of people round my way but i'm a hell of a drive from you !

[SHORTY_D]

obes said:

marT350T said:

Yeah I have already gone down that route. This engine mentioned above is sat in the middle of a mk3 polo coupe that has been fully stripped out and only ways approx 820 kg !!

nice! like the sound of that !

No idea on the rods and pistons mate, you should be able to google up a few specialists who could sort you out. Can't help thiking you'd end up having to do more and more work than just the rods and pistons though. I know a couple of people round my way but i'm a hell of a drive from you !

hi i run nos on my charged vr6 the main thing you would need to do is use forge piston they take a lot more heat but do remember you don't run nos constantly every day so i would say it depends on how offten you plan to use it, but it is addictive

[marT350T]

I would only use when at the strip for 1/4 mile runs.

I have always been a believer in if its not broke dont fix it but is is worth upgrading the pistons and rods before it goes pop ?

[v8 jago]

Mart, If the rods or pistons go then you are probably going to grove the bores and then it is either get the block relined or get a new block. I would say 25hp is easily safe and you might get away with 50hp but that might be a gamble. Im not sure as i have never used 25hp of gas but i dont think it would do much. If the bottle temp is not up then you are not going to get a true 25hp and might end up with 10-15 extra .....
Are you coming to york next sunday ???

[KUB3]

I'd like to see some pictures of the interior engine mounting.

Not sure I'd risk it any more. 25bhp isn't all that much extra, but it could be the final straw. Also is it really worth it, what with the huge extra mass of the bottle to overcome.

I'd prefer to loose more mass, if possible. Lexan windows, carbon bonnet, motorbike battery etc...

[v8 jago]

KUB3 said:

I'd like to see some pictures of the interior engine mounting.

Not sure I'd risk it any more. 25bhp isn't all that much extra, but it could be the final straw. Also is it really worth it, what with the huge extra mass of the bottle to overcome.

I'd prefer to loose more mass, if possible. Lexan windows, carbon bonnet, motorbike battery etc...

It might start getting expensive to start doing all that And then there is still the risk of the engine going bang whilst racing. If you put parts suitable for racing then they have more chance of lasting and then you can even use nitrous. Just my opinion though and racing is what i do including a healthy amount of nitrous.

[marT350T]

KUB3 said:

I'd like to see some pictures of the interior engine mounting.

Not sure I'd risk it any more. 25bhp isn't all that much extra, but it could be the final straw. Also is it really worth it, what with the huge extra mass of the bottle to overcome.

I'd prefer to loose more mass, if possible. Lexan windows, carbon bonnet, motorbike battery etc...

http://i176.photobucket.com/albums/w172/mart350t/DSC00082.jpg

http://i176.photobucket.com/albums/w172/mart350t/D...

http://i176.photobucket.com/albums/w172/mart350t/D...

Looking in to getting poly carb windows , cant find any one who makes carbon parts for mk3 polos, do you ?

[marT350T]

v8 jago said:

Mart, If the rods or pistons go then you are probably going to grove the bores and then it is either get the block relined or get a new block. I would say 25hp is easily safe and you might get away with 50hp but that might be a gamble. Im not sure as i have never used 25hp of gas but i dont think it would do much. If the bottle temp is not up then you are not going to get a true 25hp and might end up with 10-15 extra .....
Are you coming to york next sunday ???

Going down on the Saturday mate going to Rockingham on the Sunday.

Are you going to pop down one day mate to have a look at the polo ?

I think I am just going to run the car on engine and then in the winter get it stripped down and see what internals are in it then upgrade.

Is this some that Darren would do or is his speciality in big v8s ?

Edited by marT350T on Monday 30th July 16:22

[The Walrus]

Aprox costs on rods and pistons is circa 1.5k for rods and pistons and you will need the valves also at approx 0.5k have a look at JBS Autodesigns don't recommend them as a company to fit but know what works if that makes sense.

Have you thought about changing the turbo as the IHI is not reliable at anything over 320 bhp too much heat, GT28 RS or as trialed by a friend the TD05G, EVO boys seem to rave about it.

[marT350T]

The Walrus said:

Aprox costs on rods and pistons is circa 1.5k for rods and pistons and you will need the valves also at approx 0.5k have a look at JBS Autodesigns don't recommend them as a company to fit but know what works if that makes sense.

Have you thought about changing the turbo as the IHI is not reliable at anything over 320 bhp too much heat, GT28 RS or as trialed by a friend the TD05G, EVO boys seem to rave about it.

Have looked into the gt28 will have to look up the TD05G as not heard of that one before. This can is going to be a ongoing project so I will have to try to make my engine as strong as possible first then start going down the new turbo route

[The Walrus]

No probs it is a big bang turbo and delivers upto 30 psi plus a bit if you want to, at 22 psi it gave 370 bhp with a lot of slip on the rollers, the engine it is on has uprated internals and runs upto 32 psi.

In the golf it requires a small amount to be shaved off the block to fit but not much you may be able to get round this problem as you are mid engined.

Edited by The Walrus on Tuesday 31st July 09:43

[The Walrus]

http://www.blouchturbo.com/turbos/Subaru_TD05H-18G...

The turbo

[humpbackmaniac]

Mr Walrus,

What managment are your unning on that conversion? Is it still a daily drive? I am after some large gains on a standard fly by wire 20v Golf, had the remap now looking to spend 2k all up to get a bigger bang! Do you have ny links, pictures of the conversion as a whole? Well done by the way!

[v8 jago]

[/quote]

Going down on the Saturday mate going to Rockingham on the Sunday.

Are you going to pop down one day mate to have a look at the polo ?

I think I am just going to run the car on engine and then in the winter get it stripped down and see what internals are in it then upgrade.

Is this some that Darren would do or is his speciality in big v8s ?

Edited by marT350T on Monday 30th July 16:22

[/quote]

Looks like ill miss you saturday as im at a wedding.
Ill call down, I know i keep saying it but ive been very busy over the past few month.
If it has got an engine then he can sort it.. And even if it hasnt got an engine then he can make one fit. lol.

[The Walrus]

humpbackmaniac said:

Mr Walrus,

What managment are your unning on that conversion? Is it still a daily drive? I am after some large gains on a standard fly by wire 20v Golf, had the remap now looking to spend 2k all up to get a bigger bang! Do you have ny links, pictures of the conversion as a whole? Well done by the way!

How do fella, well the car I know pretty well is not mine my pockets are not that deep as it has been through a total of 3 IHI turbos one K03 a bottom end, engine block 2 gearboxes 1 diff and it is a daily ish driver.

Spec is as follows

1.8 T AUM block ( now brand new from factory)
Uprated pistons / rods / valves
TD05 G Turbo running from 22 - 32 psi
Jabba exhaust manifold (Soon to be replaced with Primary Designs mani)
Uprated grounding kit (this can be very beneficial when running high boost)
Peloquin LSD
Uprated clutch / flywheel
6 speed box from AUQ engine
3 inch custome downpipe and exhaust( you will benefit from this if running 350 plus)
S4 Maf
Silicone hoses all round
Revo custom engine management

As for big turbos as with everything it depends what you want the TD05 is a monster low down spooling from as little as 2.5k and then very strong from 3.5 - 5.5 k and beyond, negatives are in a 2 wheel drive application on modest rubber you have traction issues in the first 3 gears.

Other options are the Garret GT28RS GT30R, KKK26 to name a few.

HTH

I will try and get the old codger to post on here and give you the specifics of the rods pistons etc, he is an engineer by trade so can give you too much detail if you want it.

P.S. John if are reading only kidding

Edited by The Walrus on Tuesday 31st July 10:07

[The Walrus]

Also if you want more info on the 1.8t sign up to vw vortex it is a massive site possibly bigger than hear and if you are willing to search through the posts you will find a wealth of info on 1.8 t engines etc and details of a few guys running homemade projects over 500 WHP.

My only other recommendation on info would be APS speak to Ed who is running a 400 plus bastardised Sportec Golf mk4.