1 Turbo or 2?

dbv8 · Post by **dbv8** » Tue Jul 19, 2011 4:37 pm

I know of a quite a few TVRs that have taken the forced induction route to bigger power and i fully intend to do the same. Some have quite expensive blower set ups but i am leaning towards the turbo option.

The question is 1 or 2? I have seen success with both options but need to decide which way i want to go. Would 2 help for bigger power and less lag?
I would like to think i can treat my low compression forged piston engine to at least 1 bar of boost and ultimately 20psi.

mgbv8 · Post by **mgbv8** » Tue Jul 19, 2011 6:33 pm

I guess two would be best for a neat installation eh ??

Dont forget the Pro Charger option

Quite compact and no lag with them is there???

Talk to John Eales as I saw a TVR Pro Charged engine in his shop a while back. I'm pretty sure it was for a circuit car. I'm sure I posted a pic of it on the forum not long ago !!

For me the blower was the cheapest option. Carb off, blower on, carb back on. Move rad forward 1" and fit the pulleys

dbv8 · Post by **dbv8** » Tue Jul 19, 2011 6:55 pm

I went for a ride in this one a couple weeks ago. Had 330 @ wheels on 7psi

Eliot · Post by **Eliot** » Tue Jul 19, 2011 7:52 pm

Thats a neat install. Whenever i've looked inside the TVR engine bays I've always thought it would be easy to slap a turbo in place of the Y pipe.

mgbv8 · Post by **mgbv8** » Tue Jul 19, 2011 8:10 pm

OH MY!!!

That is a work of art mate... GET ONE!!! GET ONE NOW !!!!

dbv8 · Post by **dbv8** » Tue Jul 19, 2011 9:07 pm

Eann has developed this set up to sell as i kit. I am sure the price will be fair but i need to save fast.
There are some excellent twin turbo set ups also. I will try and get some pics.
1 i know of is a nice DIY job using 2 scooby turbos producing 490 lb/ft but tailing off quickly after the peak for some reason on only 10 psi. It is still a work in progress but looks promising.

dbv8 · Post by **dbv8** » Tue Jul 19, 2011 9:13 pm

Not the best pic but you get the idea...

dbv8 · Post by **dbv8** » Tue Jul 19, 2011 9:33 pm

Heres an excellent blower set up for some comparison (not cheap!)

stevieturbo · Post by **stevieturbo** » Wed Jul 20, 2011 12:02 am

Unless you want double the fabrication work just go for a single turbo.

There will be minimal benefits to a twin installation, but many added difficulties fitting them

And there is a pretty good range of turbos available on the used market now that will generate good power ( ie GT30-35 etc )

dbv8 · Post by **dbv8** » Wed Jul 20, 2011 8:06 am

GT35 on fleabay delivered from the states for $400.

I need to learn what else is needed.... ie to build a shopping list and the work involved.

Eliot · Post by **Eliot** » Wed Jul 20, 2011 8:35 am

dbv8 wrote:GT35 on fleabay delivered from the states for $400.

I need to learn what else is needed.... ie to build a shopping list and the work involved.

Is it a Garrett GT35 or just a GT35 - the later probably being a chinese clone.

edit - found them. NOT Garrett Gt35's. So quality is unknown and you can assume that you cant rebuild them. But for $268 its worth a punt if only for mockup!

Real GT35:
http://cgi.ebay.com/ebaymotors/Garrett- ... ccessories

Clone GT35:
http://cgi.ebay.com/ebaymotors/GODSPEED ... ccessories

dbv8 · Post by **dbv8** » Wed Jul 20, 2011 8:58 am

Thats a big difference on price!

Begs the question on how good the Chinese clones are?
Maybe the quality isnt as bad as it once were. Fastest growing economy for a reason perhaps.

stevieturbo · Post by **stevieturbo** » Wed Jul 20, 2011 9:03 am

I would just buy a good used unit that you know is genuine. For a few hundred quid more, you have peace of mind

SuperV8 · Post by **SuperV8** » Thu Jul 21, 2011 12:23 pm

Just incase you haven't seen this here is a link to Garret's site with info on turbo sizing. Very interesting.

http://www.turbobygarrett.com/turbobyga ... ch103.html

Tom.

cammmy · Post by **cammmy** » Wed Aug 17, 2011 10:23 pm

My understanding is that a properly done twin turbo setup = greatly reduced lag over a single turbo; unless you go for a twin scroll or variable geometry unit.

Personally I would lean towards a twin setup (space/money permitting) for a road/hillclimb car. Single unit would be suited to straight line/circuit work where you need maximum HP at high RPM and you won't be lifting the throttle frequently.

No point in a big turbo that makes massive hp if you're still waiting for it to come on boost by the time you get to the next corner.

Also, I highly recommend this book:

I have this and the 4-stroke version. Very good reads (note he also prefers superchargers for road use because of the instant response.)

I'm personally keen on the supercharger + electric clutch route but would take twin (parallel, not sequential) turbos over a single.

As always thought it comes down to how well planned and executed the setup is. A well designed and implemented single turbo setup would be better than a compromised twin unit setup.

I'll just add that I have never built a forced induction setup so am commenting from research + experience driving other peoples cars with various types of forced induction.