A Few Turbo Questions If You Please

[pugpete1108 62 1 Cars]

seeing as the pug is now running pretty well and there is nearly nothing left to do i have decided to make a start on a turbo install.

 

this is obviously going to be a complete diy installation even down to the manifold fabrication

 

i am thinking low boost 7-10 psi to save on uprating the internals of my engine.

 

now you will have to excuse my naivity with regards to turbo's i have done alot of reading and think i know enough to get it set up correctly but there is still alot i dont know:

 

will my std vts engine be capable of running low boost safely, ie will i need to lower the compression ratio for this? and ideally what would be the best and most readily available turbo. bearing in mind it will be a scrappy jobbie. i was considering the k03 from the audi/passat 20v or a t25 from a rover or similar ?but was unsure on what sort of boost it can generate? i understand they ran 7 psi as std so though this would be a good starting point.

 

any turbo gurus out there who can give me some advice?

 

pete

Edited August 8, 2010 by pugpete1108

[hcmini1989 16]

hi pete look into spacer plates or a really thick copper head gasket to lower your compression i can get them made up to what ever thickness you want .

Edited August 8, 2010 by hcmini1989

[james_pug 26 1 Cars]

How long will it be off the road for this time

[James_m 0]

The lynx supercharged kits utilise stock internals, not sure what kind of boost they run though, quick google will bring it up no doubt

[pugpete1108 62 1 Cars]

How long will it be off the road for this time

 

this will be done on the side mate i have no plans to take it off the road entirely i've just bloody taxed and mot'd the thing i need to get some fun out of it. whens this meet anyway?

 

The lynx supercharged kits utilise stock internals, not sure what kind of boost they run though, quick google will bring it up no doubt

 

i was stuck between supercharging and turbo charging and decide agaaints the supercharging as i cant tig weld so would be unable to fab up an inlet manifold that is up to the job. i have looked at the lynx systems that come with manifold etc but the price is way beyond what i want to spend on the car as it was always meant to be a shoestring bit of fun.

 

hence why i have gone for the turbo. i plan on using a stock gti6 bannnana manifold cut down and using bends etc of similar spec material and a flange for the turbo to bolt to.

 

and liam, i thought i may need a spacer plate but was not really sure on thickiness etc?

 

its gonna be another try it and see project i guess

[powermandan 0]

if your going to the trouble of doing a conversion, you proberbly should try and make a proper job of it and lower the compression. the 8v turbo engine runs 8.5:1 compression so thats proberbly a good figure to aim for if your using the stock bottom end.

 

Since you already have megasquirt the cost difference between running large boost and low boost is not that much.

Edited August 8, 2010 by powermandan

[wracing 19]

Don't lower the compression, run a sensible boost figure with close to standard compression with close to standard components.

 

This mix will give you a cheap, powerful and flexible engine. 16v on low compression are a dog off boost, by keeping a relativity high compression ratio you will add to the existing engines characteristics. With good mapping this will also give you great fuel economy!

 

Lowering compression ratios is old hat!

 

It will be worth adding a knock sensor to your mega squirt. Save and by a turbo like a gt28r I cant remember the trim but its great for 16 valve xu's

 

James

[pugpete1108 62 1 Cars]

Don't lower the compression, run a sensible boost figure with close to standard compression with close to standard components.

 

This mix will give you a cheap, powerful and flexible engine. 16v on low compression are a dog off boost, by keeping a relativity high compression ratio you will add to the existing engines characteristics. With good mapping this will also give you great fuel economy!

 

Lowering compression ratios is old hat!

 

It will be worth adding a knock sensor to your mega squirt. Save and by a turbo like a gt28r I cant remember the trim but its great for 16 valve xu's

 

James

 

cheers james thats what i like to hear what cars carry the gt28r ? or is it aftermarket only.

 

also is fitting a knock sensor and setting it up difficult?

 

ps gutted about the marham day but my old lady reminded me i had already arranged to go to a work family day on the 4th.

 

pete

 

edit: just had a look and found some gt28's on ebay usa for 229 delivered. anygood?

Edited August 9, 2010 by pugpete1108

[stebbs 5]

I`m running low comp pistons and mines fine off boost. Just don`t go OTT with the size of the turbo. Aim for your power figure with a turbo suited to that power.

[wracing 19]

A GT28r is around 700 pounds when I last looked and a little more for the roller bearing version. So when you take into account that that "ebay turbo" is 229 pounds delivered then its kinda a no brainer on a little DIY build like this! But (theres always a but) they are very finicky about oil pressure and exaust back pressure, that can be the difference between turbo lasting 50,000 miles or 50 miles.

 

The advantage with SOME ebay turbo's is that you can rebuild them with genuine Garrett/Holset parts.

 

That said I think you may be better getting a second hand unit off a Nissan (they have the gt28r standard I think) rebuilt then you have a genuine turbo as good as new.

 

Nope not hard check out glens garage they do a nice little board with everything you need on it!! sensor ---------Shielded wire----------Megasquirt. Job done This will allow you to run a fully closed loop system with decent amounts of advance on boost, and a high boost for your compression ratio.

 

Thanks

 

James

[pugpete1108 62 1 Cars]

checked on glens garage but couldnt see anything on there?

 

i have emailed them anyway to see what they can offer

[Rob Turbo 3]

On glens garage there's an extra daughter card, it's in the megasquirt kits section IIRC, it has a knock circuit on it along with all the other circuits such as boost control, 2nd vr trigger, fan control, nitrous control, shift lights etc.. it's not a tuned knock circuit though, it needs setting up, which can be a problem!

 

You'd be better off using the KnocksenseMS, I plan on using one myself this time round, even though I already have the extra daughter card (maybe see if they can accomodate a group buy?)

[pugpete1108 62 1 Cars]

On glens garage there's an extra daughter card, it's in the megasquirt kits section IIRC, it has a knock circuit on it along with all the other circuits such as boost control, 2nd vr trigger, fan control, nitrous control, shift lights etc.. it's not a tuned knock circuit though, it needs setting up, which can be a problem!

 

You'd be better off using the KnocksenseMS, I plan on using one myself this time round, even though I already have the extra s daughter card (maybe see if they can accomodate a group buy?)

 

cheers for that rob, that looks spot on for what i need not too complicated and just a light to tell you if its knocking.

 

will have to pick up an actual sensor though as i think i ditched mine ages ago (thats if the vts engine had one? looks familiar thought)

 

it would be nice to have the ecu correct it for me though....hmmmm

[Rob Turbo 3]

The knocksenseMS is an LED and an input to the megasquirt to control the advance if there's any knock (there's 2 versions on that site, knocksense and knocksenseMS).

 

There may be a simple way to tune the extra daughter card's knock circuit but I don't plan on taking the risk until I know for sure how it's done and can test it.

[wracing 19]

the best way to tune it is with a spanner, hit the block and tune the pots till it detects the knock, then with a running engine provoke the onset of knock to test that the sensor work.

 

What ever driver you use you must do this as every mounting point has a different characteristic.

 

Pete you would need to mount the knock sensor in the standard location between cyl 2+3 on the front of the block!

 

Thanks

 

James

[pugpete1108 62 1 Cars]

The knocksenseMS is an LED and an input to the megasquirt to control the advance if there's any knock (there's 2 versions on that site, knocksense and knocksenseMS).

 

There may be a simple way to tune the extra daughter card's knock circuit but I don't plan on taking the risk until I know for sure how it's done and can test it.

 

 

ah yes i see now, makes sense to get that one then. not alot of difference with cost between that and a daughter board

[Guest levis]

Hi, may I drop my question here...

 

I am building a Turbo engine.

 

Right now it is going to be a XU9J4 + head from XU10J4TE + cams from XUJ94 + Crank from XUD9TE + pistons from XU10J4TE + Turbo GT28RS

 

My goal is 300-340 hp.

 

QUESTION:

 

Which rods to use: XU10 = 86mm, XU9 = 88mm

 

Where I can buy a good liners and rings (I don't know the proper name).

 

any suggestions for me in building this engine ?

 

Thanks :-)