My mate said he'd seena mate who.... or was it you?

shen · Post by **shen** » Tue Apr 10, 2007 1:45 pm

Out of interest .. how many people have actually blown pistons, cracked Head Gaskets, Caused natural disasters in third world countries etc by boosting over 14psi on standard internals?

and just how far did you push it?

I've ran my t16 at 14psi for ages now and only just put it back to 12psi due to all the woe and doom stories from people on here but i gave it a right old spanking alot for several months and never had a prob....

so that's why the poll..

Has something terrible actually happened to you or is it a case of my mates dad's friend's baby sitter's boyfriends t16 engine blew up etc.

This poll is not to say anybody is a liar or that people over state the damage by boosting... It is fact that high boost will crack pistons! Hoever i'm hoping that this poll might be able to ascertain just how likely it is to happen to you.

walshy.walsh · Post by **walshy.walsh** » Tue Apr 10, 2007 1:51 pm

nothing is set in stone, it is just known that 12psi is a "safe" limit! anymore, and you are into no-mans land, you may be ok, you may not! and as engines vary so much from one to the other, somebody running 16psi may be ok forever, whereas somebody running 14psi may melt it at anytime! HTH

requestingaflyby · Post by **requestingaflyby** » Tue Apr 10, 2007 2:05 pm

i once had a t16 running about 18psi, it was quite happy doing that for a few months, then one day bang!

didn't investigate to much, just dropped in new lump and never went over 13psi then.

once i got the car running i investigated the old lump, pistons all looked fine, had bent a rod though

xr4x4 · Post by **xr4x4** » Tue Apr 10, 2007 5:40 pm

trouble is the T16 in std form..IE with a T25 runs very high EGTs and thats what melts pistons..

the higher the BHP and boost the more likley you are to get det... det kills the crowns and can break ring lands and bends rods.

you could be doing damage to your pistons and not knowing it... lasting for thousands of miles.

if you have a T25 and a std intercooler, keep it under 12psi
with a FMIC 13-14 at a risk..more so in the summer.
with a T28 and a FMIC i would be happy running 15psi.

this would all need to be checked on the rollers for fueling and det.

imo

EDIT
i would also like to add that theres no point in turning the boost up if it isnt making anymore power. on a std T25 + IC your are just pushin hot air anyways.

victor3 · Post by **victor3** » Tue Apr 10, 2007 6:34 pm

Ringlands went on mine at 13psi.

...and that was with a FMIC and water injection!!

John W · Post by **John W** » Tue Apr 10, 2007 6:39 pm

Ran mine at 14psi...

Glynn · Post by **Glynn** » Tue Apr 10, 2007 6:58 pm

Im due to investagate mine at the mo, fitted new turbo with too strong an actuator and it was boosting to 19psi, Trying diff things and kept taking it for a blast, Result in mine smoking like a train,

I think that the higher boost on these few times did my rings in and lost me power

Will find out the weekend

xr4x4 · Post by **xr4x4** » Tue Apr 10, 2007 11:50 pm

John W wrote:Ran mine at 14psi...

is that det?

cocacola · Post by **cocacola** » Wed Apr 11, 2007 12:44 am

no thats a hole.....

ill get my coat

Ross9 · Post by **Ross9** » Wed Apr 11, 2007 1:05 am

or you could just be really silly and run 13+psi on a T28, with a standard IC lol.

Sunday - run 14.2 @ 102 1/4 mile

Next Sat - run 236 but with a bit of det and intake temps toucing 77 degrees.

Following wednesday - diagnosed with trollied ring's after leak down test.
In short, I got a couple of months of fun, then it died. Fixed and improved now.

Ross

John W · Post by **John W** » Wed Apr 11, 2007 6:37 pm

xr4x4 wrote:
John W wrote:Ran mine at 14psi...

is that det?

It does look like it on the picy but couldn't hear any tbh.

I had a starchip fitted which added a little bit of ignition, was told not to run it higher than 13psi but as the new engine was on order thought I'd see wot happened.

Cracked the ring lands on two other sets of pistons running the above set up at 13psi. Never actually did any damage to the block amazingly, just buy another set of pistons and hammer it for a few more thousand miles!

simonptomcat · Post by **simonptomcat** » Wed Apr 11, 2007 6:44 pm

Nope but i know a man who did, VERY low miler and it lasted 18 months, before a rod bent, piston cracked, head crackd and box blew! needless to say the car was never the same again!

5teve L · Post by **5teve L** » Wed Apr 11, 2007 8:23 pm

I ran 14 psi & never had any probs,that was with a larger intercooler & T25,my brother ran 15 with a boost spike to 18 on his old 420 & it lasted about 3 months before it bent a rod & did the ringlands(this was after the motobodge treatment

)

Steve

Post by **Punx0r** » Thu Apr 12, 2007 1:13 pm

Interesting to see so many people bending rods rather than just cracking/melting pistons... I was under the impression that people had used standard T-series rods with forged pistons at 300bhp without problems.

So what's killing them on standard pistons with a sniff more boost? Cracked piston leaking oil and causing det?

Post by **SubCat001** » Thu Apr 12, 2007 2:46 pm

Punx0r wrote:Interesting to see so many people bending rods rather than just cracking/melting pistons... I was under the impression that people had used standard T-series rods with forged pistons at 300bhp without problems.

They will, if its been done properly. Det can, and will, bend and destroy most things.

Graham_Gargett · Post by **Graham_Gargett** » Thu Apr 12, 2007 4:27 pm

Ive ran 13psi for almost 2 years with no prob what so ever. Just on with an engine rebuild now.

The whole rod thing got me worried tho. Ive bought forgies but will std rods be ok. Using a T28rs 86 and huge front mount.

shen · Post by **shen** » Thu Apr 12, 2007 4:35 pm

thats not exactly standard

Graham_Gargett · Post by **Graham_Gargett** » Thu Apr 12, 2007 5:09 pm

Thats the new spec lol

shen · Post by **shen** » Thu Apr 12, 2007 5:13 pm

lucky sod..i need to save some pennies for a t28

hope the rubuild and bedding in goes sweet for ya.

Graham_Gargett · Post by **Graham_Gargett** » Thu Apr 12, 2007 5:24 pm

Saving for DTA now from GBE. Going off topic now. My bad

Post by **Punx0r** » Thu Apr 12, 2007 8:44 pm

SubCat001 wrote:
Punx0r wrote:Interesting to see so many people bending rods rather than just cracking/melting pistons... I was under the impression that people had used standard T-series rods with forged pistons at 300bhp without problems.
They will, if its been done properly. Det can, and will, bend and destroy most things.

I real question though is why would you get det from merely turning the boost up from 12psi to 14psi on a standard engine? I've not heard anyone on here complain of knocking on standardish engines.

Si · Post by Si » Thu Apr 12, 2007 10:36 pm

xr4x4 wrote:
John W wrote:Ran mine at 14psi...

is that det?

That will be a spark plug causing preignition, was probably glowing cherry red and melted straight through the piston.

Post by **SubCat001** » Fri Apr 13, 2007 12:29 pm

Punx0r wrote:
SubCat001 wrote:
Punx0r wrote:Interesting to see so many people bending rods rather than just cracking/melting pistons... I was under the impression that people had used standard T-series rods with forged pistons at 300bhp without problems.
They will, if its been done properly. Det can, and will, bend and destroy most things.
I real question though is why would you get det from merely turning the boost up from 12psi to 14psi on a standard engine? I've not heard anyone on here complain of knocking on standardish engines.

Well from reading the comments those that did bend rods where running or spiking to 18psi on standard management with no mention of additional fuel control.

Certainly not saying oe rods are indestructable. But bad tuning can kill anything, and people tend to take a little more care when they have spent the time and money rebuilding an engine.

Post by **Punx0r** » Fri Apr 13, 2007 12:55 pm

Good point, I hadn't considered high psi spikes

Shorty_JK · Post by **Shorty_JK** » Tue Apr 17, 2007 12:30 pm

cocacola wrote:no thats a hole.....

ill get my coat

lmao , that tickled me

boxertricks · Post by **boxertricks** » Sun Feb 24, 2008 4:43 pm

Im currently upgrading my bhp a set at a time and my first goals are to get to around 250bhp with a custom fabricated exhaust from elbow, gt28r turbo, fmic bigger induction and the boost set at a comfotable 12 psi, forget about putting aymore boost on std turbo and set up because imo its not making any difference anyway but even wuth this increase in power im not going to risk any more boost than 12 psi to be on the safe side and still have a reliable fast motor to use on a daily basis

will-220GSiTurbo · Post by **will-220GSiTurbo** » Sun Feb 24, 2008 5:49 pm

I ran my coupe and vitesse @ 14 psi, but that was normal driving, my GSi turbo had a buggered actuator, it would only hold 9 psi tops, scotts old Ti which i bought would spike 14 and hold just over 13, it had no problems running that but it did have a nice strong engine with decent compression.
I wouldnt run a high mileage T16 on anything over standard because IMO its just a matter of time until it drops the turbo seals for starters, anyway

EDIT: how old is this thread!!

shen · Post by **shen** » Sun Feb 24, 2008 8:09 pm

will-220GSiTurbo wrote:
how old is this thread!!

too old to bring back from the dead just to not answer it.

juliangungho · Post by **juliangungho** » Mon Feb 25, 2008 8:36 am

hmm, ouch poor piston.

in our group down here all the engines have been set for 14psi both mk1 anf mk2 600's . never had any problems with piston damage just everything else lol

.

Post by **Fordimus Prime** » Mon Feb 25, 2008 11:17 am

boxertricks wrote:Im currently upgrading my bhp a set at a time and my first goals are to get to around 250bhp with a custom fabricated exhaust from elbow, gt28r turbo, fmic bigger induction and the boost set at a comfotable 12 psi, forget about putting aymore boost on std turbo and set up because imo its not making any difference anyway but even wuth this increase in power im not going to risk any more boost than 12 psi to be on the safe side and still have a reliable fast motor to use on a daily basis

sensible way of doing it.

- i managed to get bang on 250 (which was more than I was expecting, with similar setup. Think i was running 13psi. It seems quite happy at the moment, although i may turn it down for the summer (especially in when i go to le mans).

My view- is an extra 10 bhp or so, really worth the risk. It could be fine for years at 14 or 15 psi. But it might not. At 12/13 though, i know it'll last.

As it is, im still slightly worryed im pushing that engine far beyond its safety margins, at 250 bhp!

Had fueling checked on RR, and its still slightly rich, so at least its not going to lean out.

Spiking also a concern- i get a very slight spike when the throttle is poked hard. (i can see why people like electronic boost controllers). This is another reason i wont wind boost up any higher. I drive accordingly though, and push throttle down progressively- i dont 'mash it'

boxertricks · Post by **boxertricks** » Mon Feb 25, 2008 4:24 pm

yeah im going to be using a hks evc because its much more accurate and you can gradually build the boost up which imo is a much safer option

Ozz · Post by **Ozz** » Mon Feb 25, 2008 4:47 pm

Used to run standard T16 on 14psi with no probs what so ever

ran a T16 with forged bottom end on silly boost (over 23psi) with DTA and have the reminants of an Accralite on my desk as a paperweight

Si · Post by Si » Mon Feb 25, 2008 4:49 pm

Torque kills the ring lands.

It's not related to boost.

walshy.walsh · Post by **walshy.walsh** » Mon Feb 25, 2008 4:50 pm

Si wrote:Torque kills the ring lands.

It's not related to boost.

so the 12psi bit is all doggies?

Si · Post by Si » Mon Feb 25, 2008 5:04 pm

walshy.walsh wrote:
Si wrote:Torque kills the ring lands.

It's not related to boost.
so the 12psi bit is all doggies?

Well 12psi should result in X torque, however not all engine's are equal.

Rovertech 2.0

My mate said he'd seena mate who.... or was it you?

Have you ever damaged your T16 by boosting at 14psi?

My mate said he'd seena mate who.... or was it you?