Is there such a thing as a low pressure turbo?

[QBee]

I used to have a Saab 9-5 2.3 LPT, (before I had the similar 250 bhp 2.3 HOT Aero). With Sports suspension and about 190 bhp it was, in all honesty, the nicer car to drive. You were totally unaware of the turbo, no big gobbets of power when it was designed to most embarrass you, no waiting for turbos to spin up, just smooth, fast power delivery and fantastic overtaking performance (for a middle-weight family auto box estate car - a real stealth car).

I have ample power in my Chim already , BUT I wouldn't exactly say no to say an extra 50-60 bhp if it could be smoothly delivered as in the Saab. Jools (I think it was) mentioned the idea to a friend of mine recently in my presence, and confirmed it yesterday at Snetterton, and the idea of such a kit rather appeals if it could be installed perhaps without intercooler and with no additional implications (so no excessive heat issues and no upgrades to gearbox, drive shafts, clutch, diff, etc, ie within the designed-in capabilities of the standard car.

Using you guys' experience, rather than googling ad nauseam on Maxxxxx Powahhh, has anyone got any suggestions for a simple kit that I can perhaps install myself/ourselves (over a barbecue Sunday ), for about the price of a set of tyres? Or am I pipe-dreaming as usual?

[Pupp]

there y'go

Less than even a set of Federals too

[phazed]

Ha ha!

[s p a c e m a n]

79 sold?

The thing is you'll still need to modify everything that you would for a normal turbo install (apart from the intercooler if you wanted) so it would cost more or less the same. How about doing a proper turbo install but change the engine management too so you can run two separate maps, one for low pressure and one for whatever everyone else runs?

[SILICONEKIDOBHP]

My 2005 Fiat Scudo has a Turbo and is inter cooled,i can`t have much boost .I`m wondering if something like that could be fitted on my engine ..

The non Turbo version is around 70hp and mine 110hp .. That`s some going for a low power diesel .

I would like another 50hp on low boost.

[jojackson4]

Like wize Daz my transit is a 130 bhp but there's a difference between oil burners and
Petrol blowers dot ask me what but there is some difference when I was shopping foe the bike
Blower there were loads of derv blowers but no use so whent for a td04 from a t5 volvo

[QBee]

Very witty Pupp! And I do like a good laugh.
Another idea to paper the toilet wall

[Pupp]

Joking aside, what you've described is not at all far off what an SC Power rotary blower will deliver. I'm sure the unit could be specced and sized to deliver its boost very early in the rev range, which is what the saab LPT system does. Problem with trying that with a turbo on a big(ish) V8 is that the necessarily small turbo housing (to promote early spool) will just become a restriction up the range - maybe something clever could be done with variable vanes and nozzles but the electronics and control gear involved would put it well beyond any feasibly DIY install

[l6rth]

If you don't want lumpy power why not just supercharge it? Power right from idle?

[Hoofa]

Cos the question was low pressure turbo ?.... Do the maths supercharger is going cost what for 60 bhp ?... How much per bhp ? Turbo is going to be cheaper cos your not paying shed loads for a mounting bracket

[Richard 858]

Don't know where the idea of a supercharger adding 60 bhp comes from ? My N.A, 450 gave 275 bhp before SC500 kit fitted (DIY) and 415 bhp after (and that was below 5,000rpm with some belt slip !) I make that 140 bhp increase.

[Richard 858]

Alright I've had a few ciders and realise now that you're talking about lower capacity oil burners, sorry !!

[QBee]

Thanks guys - this is turning interesting.

I was talking about petrol engines throughout. My Saabs were proper ones, 2.3 petrol.

I think what I was trying to establish is whether there is a relatively cheap upgrade which would a just give me 360 bhp against the present 300, hence keep the car within the stress limits of the standard drive shafts, diff etc.
I want to avoid what I understand to be the cost and the issues that can be created by adding 140-200 bhp, as I am already happy with the way the car drives.

One possible issue - my 5 litre engine already has a 10:1 compression ratio.

[Alexdaredevils]

Am I allowed to laugh? Mr Qbee

[QBee]

Of course, Alex...I know what I said...just toying with an idea for now. Quite probably won't do anything about it, but if I do it will have to be cheap as chips, and not require any other modifications (other than a quick remap).

[Aldor]

A bigger cam perhaps ?

[QBee]

Hadn't thought of that. I like the way my stealth cam drives, but will ask questions

[SILICONEKIDOBHP]

QBee said:

Hadn't thought of that. I like the way my stealth cam drives, but will ask questions

Your after market ECU can iron out any cam and give you low down smooth driving ..

Sorry Anthony i remembered you are still on the 14cux

Looks like another trip to see Mr Adams

[rigga]

Could alwayss run a Turbo at actuator pressure only so low boost, if I recall my impreza was 0.7bar like this.
Full boost was 1.3,don't sound like much of a difference buts its huge.

[Bassfiend229hp]

...as an aside (but not wanting to start a new thread however I know that QBee is a friendly face so won't object too much) - has anyone seen this:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&am...

What on earth!?!?!?

Phil