70Turbobug´s 2 liter turbo

[NO_H2O]

Sounds like you have a great project going. I have been thinking of building a turbo engine much like yours down the road (need to finish y 2.4L N/A first) I was thinking of the Web 119 cam. What made you pick the 86A?

[70Turbobug]

Originally Posted by NO_H2O

Sounds like you have a great project going. I have been thinking of building a turbo engine much like yours down the road (need to finish y 2.4L N/A first) I was thinking of the Web 119 cam. What made you pick the 86A?

I wanted a cam slightly more agressive than the 119 without losing idle quality.I´m hoping it will be a bit more snappy and faster on spool up.My original choice was the 163 but the 86a runs much smoother and I believe it is a better cam for a 2 liter.If I was to build a 2.4 turbo I would go with a 163 on a 110LC.

Thanks Clive for the info! I don´t mind a car that is a bit harsh.It´s a car made for for fun so some comprimises have to be made.My main focus is stability,safety and driveability.I´ll sacrifice some comfort in exchange.I got to drive a Lotus Elise this summer and the car´s handling really impressed me.So easy and precise and stable.It´s probably not possible, but f I can get near that kind of handling I´ll be happy.

[70Turbobug]

A little update on the 2 liter turbo project.I´m back from vacation and picked up my parts from Remmele.

The heads are also finsished but I have sold them.Instead Remmele is going to do me up a set of CU heads.I´ve decided to go with the CU heads for a couple of reasons.First - more flow,more meat in the chamber and ports along with larger ports.I will be using 45x39 valves and dual springs 130Kg.The exhaust valves will be Mercedes 7mm stem sodium filled.The intake valve is a Remmele valve.Another reason is there´s more surface to seal for the header in the square port than the oval port.
I will more than likely use the BAS stainless header like Wally.Yes - I am a copy cat in this case.What convinced me is that Wally is now using a GT3076 Turbo and it fits in the same location as the old turbo which was considerably smaller.But Wally´persistance and 350HP don´t have anything to do with it

The crank and rods are also here - but no need to show that since they are completely stock - just well balanced.
3.5 kg Flywheel - including surface rust...I need to clean it up

[Wally]

Good looking parts Mark!

Originally Posted by 70Turbobug

I will more than likely use the BAS stainless header like Wally....

Thats quite a change in thought Mark! I can remember you critising my BAS header choice wrt strength and diameter...
And I copied it from Sandeep you know.
Well, better well copied than ill made

[Sandeep]

Originally Posted by Wally

And I copied it from Sandeep you know.

My bug may be sporting a ducktail with air-air intercooler spring 2010 . I'm pretty sure that 350 HP / GT3076R had nothing to do with it ...

Sandeep

[Wally]

Originally Posted by 70Turbobug

I wanted a cam slightly more agressive than the 119 without losing idle quality.I´m hoping it will be a bit more snappy and faster on spool up.My original choice was the 163 but the 86a runs much smoother and I believe it is a better cam for a 2 liter. .

Just checked webcamshafts website and I think the valve lift of the 86a is too small (11.05mm). Turbo's love valve lift is my current experience.
There's probably a reason Webcam advertises their 119 as a turbo cam...
I would advise to change the cam to one with about half an inch lift (12,7mm)
1.7mm lift difference is A LOT!

Just my 0.02 cents worth of friendly advise

[70Turbobug]

Thanks Wally! I will be sending the heads off next week sometime,they will basically be the version 5 heads that Remmele offers only with sodium filled exhaust valves.If your header hasn´t cracked or any other issues by now,it won´t in the future either.So 1:0 for you

Armin has also upgraded to a 2.2 liter! Although with a 78mm Demello crank and a Garrett 2871 journal bearing turbo.He made 2 new videos also: this one is with the K26/K27 turbo:http://www.myvideo.de/watch/6952429/...g_Classic_2009 and this one is with the 2871 turbo: http://www.myvideo.de/watch/6952465/...zburgring_2009.

[Wally]

Originally Posted by 70Turbobug

Thanks Wally! I will be sending the heads off next week sometime,they will basically be the version 5 heads that Remmele offers only with sodium filled exhaust valves.If your header hasn´t cracked or any other issues by now,it won´t in the future either.So 1:0 for you

Only 1:0 ?
But serieusly, you can also consider the CSP sidewinder header which has stub-pipes, is also stainless and seemed very well made also. I like stub-pipes for a turbo engine.
Furthermore, the equal length IS an advantage with a turbo engine as well. Trust me (4:0 )

Armin has also upgraded to a 2.2 liter! Although with a 78mm Demello crank and a Garrett 2871 journal bearing turbo.He made 2 new videos also: this one is with the K26/K27 turbo:http://www.myvideo.de/watch/6952429/...g_Classic_2009 and this one is with the 2871 turbo: http://www.myvideo.de/watch/6952465/...zburgring_2009.

Cool vid's! Its alomost embarressing to see how he closes in and overtakes all those Porsches... but he should wear a helmet at the track I think (second vid)
He is probably a better track driver than I am, but I think I do better at the strip

[bow]

i like that flywheel home made?

[70Turbobug]

Originally Posted by bow

i like that flywheel home made?

Thanks,no it´s just an ordinary 215mm flywheel that has been machined.Many remove material further inward or machine holes between the clutch surface area and the flange.That doesn´t help so much imho since the weight on the outside of the clutch surface area has more gyroscopic effect and inertia than further inboard.That´s why I had outer area machined.That´s nothing new though - there are a few tuners here in Germany who have been doing this for many years.

[Wally]

Originally Posted by 70Turbobug

Many remove material further inward or machine holes between the clutch surface area and the flange.That doesn´t help so much imho since the weight on the outside of the clutch surface area has more gyroscopic effect and inertia than further inboard.That´s why I had outer area machined.

Good thinking! making the rotating mass lesser on a turbo engine might help with spool-up as it revs up quicker.
Light-weight pistons and rods help as well in that train of thought.

Brave of Armin to run on the track with 1,3 bar!

[70Turbobug]

The CSP header is well made,but also considerably more expensive 560 Euros vs. 880 Euros.The A-1 header is also an option.But the price/performance of the BAS speaks seems better to me.The stub pipes from Armin I will be using are better/stronger than the CSP stubpipes included with their header.Did you make any mods to the header?

Cool vid's! Its alomost embarressing to see how he closes in and overtakes all those Porsches... but he should wear a helmet at the track I think (second vid)
He is probably a better track driver than I am, but I think I do better at the strip

Embarrassing for those Porsche drivers for sure and he still only uses 1.3 bar boost.Check out his other vids also where he chases a Ferrari and GT40 around the track.I would have loved to have seen the look on their faces! I wouldn´t say he´s better at the track - he just might be a little crazier than you,though He still drives to and from the track with it and drives it nearly everyday...when he´s not driving his 2 liter type 4 turbo 912.

[Wally]

Originally Posted by 70Turbobug

- he just might be a little crazier than you,though

Errr, make that a LOT crazier

[bow]

hmm food for thought thanks! maybe i can find someone around here who can do it! wishful thinking im sure

[70Turbobug]

Good thinking! making the rotating mass lesser on a turbo engine might help with spool-up as it revs up quicker.
Light-weight pistons and rods help as well in that train of thought.

Light rods and pistons would surely make it rev even quicker for sure.That might be an option later on.For now I will use the stock rods with Raceware bolts.

Brave of Armin to run on the track with 1,3 bar!

He had ran up to 1.8 bar in a long distance race once without knowing it.The boost gauge still showed around 1.3 bar.Later he found a small hole in the wastegate senseline.All other gauges showed normal operating temps - i.e. CHT,oil temp and afr...and still drove home after the race from the A-1 ring back to Ulm 400km IIRC...
with stock cast bus pistons!