Boost Pressure #'s

[CODE4LS1]

I have done this conversion on my N/A diesel and so far so good.  No excessive blow-by and no oil consumption so far.  Still at stock boost settings 10-12psi until I find an intercooler.  I go up hills in 5th gear now!

[camboscams]

CODE4LS1, did you notice a pretty good power gain after this gain? What were your milage numbers after this? do you have a MLS HG and head studs or are you running this much boost with a factory HG?

[saurkraut]

You can get allot of power, with very little smoke and a low EGT.

When I was road testing my 1.5TD, it had NO PROBLEM accelerating in fifth gear.  I did a four car pass with it on a two lane road where the posted speed limit was 55.  It completed the pass no problem, with a terminal speed of 85MPH and it hadn't topped out yet.

Here is the formula:

Head studs
2.5" pipe, turbo to rear bumper
Pre turbo EGT measurement
TD pump
Disable the POS blow off valve.
Disconect plug the waste gate line.
Back out the governor screw the widthe of one jam nut
Readjust the pin on the throttle arm to make use of the additional travel
Fire for effect.

Studs are manditory.  The metal head gasket is optional.  I ran a butt load of boost (30 PSI)on my 1.6 for years with the stock head gasket and Raceware head studs, and never had a gasket failure.  I eventually broke the cylinder head; cracks across the entire span of the bore, all cylinders.  ( I'll clean it up and take some pictures, Its impressive)  The stock head gasket was still good.

[CODE4LS1]

CODE4LS1, did you notice a pretty good power gain after this gain? What were your milage numbers after this? do you have a MLS HG and head studs or are you running this much boost with a factory HG?

Very noticeable power gain.  When I floor the accelerator it goes right up to 12psi and stays there.  Still using the factory fiber HG and factory head bolts.  No problems yet but I am buying the ARP studs and metal 1.9 HG so I can turn up the boost later.

My mileage is between 35-37 US MPG.  This is because my Caddy is my work vehicle so I carry all my carpet cleaning equipment in the back, as well as the shell.  My driving style also plays a part in it, as I like to go 75-80 MPH on all the freeways.  I still think 35-37 MPG is excellent considering all the weight I pull around in it.  My 2000 Chevy S-10 with the 4.3 V6 only got about 21 MPG at best with my driving style

[53 willys]

I always thought it was the compression strokes combustion pressure with the added boost that blew the head gaskets. But from Jt's statement it is the EGT's that do it.

Interesting....

nope your right...EGT's dont kill head gaskets...excessive drive pressure does....


excessive EGT's melt pistons and break down oil and engine parts...but have no effect on the HG...
EGT's do not kill headgaskets....




drive pressure is VERY important!!

[spencebm]

how do you lower the drive pressure?

[8v-of-fury]

what exactly is the drive pressure?

[MJF]

Exhaust Manifold Pressure. The bigger exhaust housing, the lower emp.

[camboscams]

The bigger exhaust housing, the lower emp.

As in, the exhaust turbine housing, or the manifold itself?

Very noticeable power gain. When I floor the accelerator it goes right up to 12psi and stays there. Still using the factory fiber HG and factory head bolts. No problems yet but I am buying the ARP studs and metal 1.9 HG so I can turn up the boost later.

My mileage is between 35-37 US MPG. This is because my Caddy is my work vehicle so I carry all my carpet cleaning equipment in the back, as well as the shell. My driving style also plays a part in it, as I like to go 75-80 MPH on all the freeways. I still think 35-37 MPG is excellent considering all the weight I pull around in it. My 2000 Chevy S-10 with the 4.3 V6 only got about 21 MPG at best with my driving style

Thanks CODE4LS1, that is very useful info to me! Now I know what my comfey limits are :wink: Cant wait to get this bad boy on the road, need to finish the bodywork and paint first :wink:

[hamradio]

Here's my once-1.6na-now-VNT15 rabbit.

http://www.youtube.com/watch?v=ckHUSaZrYsE


Kind of a poor video, but it shows how quickly the turbo spools.




I'm controlling vanes with a pneumatic actuator.  I quickly threw together a boost controller one day, and drove around on 15 PSI.  My boost controller could not react quickly enough, or something...On every shift, I could easily spike to 20-25 psi...it pegged my 15 psi gauge quickly.

[8v-of-fury]

cool video! wow vnt's spool like instantly eh? lol

[jtanguay]

cool video! wow vnt's spool like instantly eh? lol

ya.. i like this video of Tintin's old VNT-20 TDI

[camboscams]

Thanks for the video Hamradio! You running a straight pipe exhaust, that VNT spooling up and down is loud...Awsome!

[Rabbit TD]

Well if i had a choice i'd perfer not to melt my new "King" pistons. so basicly what i gather from these statements is to keep enough boost to keep the smoke levels down. But not enough to blow the HG.(If only i knew what the magic number is? :lol: )

but there is a solution! VNT

 

BTW the IHI is ballbearing 30% faster spooling then thrust

bearing :twisted:

Did you get your pistons at Parts Place by chance?  I just got a rebuild kit for my T/D from them and that's what mine are.  The last kit I got from them had Mahle pistons with it and I just hope these KING ones are as good as the other ones are.  Actualy I'm more concerned about the rings.

[camboscams]

Did you get your pistons at Parts Place by chance? I just got a rebuild kit for my T/D from them and that's what mine are. The last kit I got from them had Mahle pistons with it and I just hope these KING ones are as good as the other ones are. Actualy I'm more concerned about the rings.

Sure did, hefty price, after miking the pistons (which where all to same size) i bored and honed my block, they slipped right in, noooo problems .......Plus they already had the cut outs for the piston oilers, i don't have them but that would be nice to skip that step if that day ever came when i wanted to install them. Time will tell how they hold up. I'll let you know how they held up about 400,000miles from March :lol: