2.4 Turbo boost

[crusty]

I moght think about fitting an adjustable wastegate controller when I have the money and run at about 10psi, however one of the other drawbacks that has been mentioned is the increase in turbo lag which to be honest the surf has enough of in spades anway.

Cheers

You'll actually find the opposite. A manual boost controller generally allows boost to build quicker.
I agree 100% with your point about reliability. People need to decide what they prefer, a bit more boost (& hp) or an engine with less chance of being damaged (headgaskets can be sensitive to more cylinder pressuse) and large repair bills.

I don't personally feel the need for a more powerful Surf. If I want to go fast, I'll drive my MX6 with 12psi. I really don't mind the way the surf drives, it's still a lot more responsive than many deisel 4WD's around. We get a Nissan Terrano (pathfinder) with a 2.7TD in oz as an import, I find the 2.4TD surf quicker than that even though the surf is heavier.

[big d]

ifs its giving you a boost, does it come of any ealier when you achieve cruising speed, allthough mine is on nearly all the time it is obviously not doing much damage, as it goes all day,

[crusty]

Your turbo is spinning the whole time. I don't have a gauge on my surf so I don't know what activates the green light on the dash, I'd imagine it illumintes @ >0 psi & only goes off when your manifold is in vacuum. I GUESS.

Any increase in PSI will increase the stress on an engine, whether our motor can handle it or not is not something I don't have the answer for.
The point of my post was to disapprove of simply restricting the WG to gain extra boost. A manual (or elecrtronic) boost controller does is more safely. But again, don't play with boost unless you know EXACTLY what levels your at (get a gauge). I had a friend who decided to use a bleed valve to up his boost without a gauge & grenaded his Mazda. After a engine rebuild he fitted a gauge, his set up was @ 26psi and the MX6 runs out of fuel by 17psi. Don't risk busting your engine.

[Healewis]

Just tinkering on my truck, doing the belts and checking the levels, then my attention became focused on that turbo boosting thingymijig!! I have a turbo guage installed and the max it will go up to is 0.7, that's flat out, so just out of quriosity,I fitted the washers as described and adjusted it by 3/16ths of an inch. Then took my baby for a spin, the guage will only go up to 0.75. maye I should have spaced it more but, I struggled to get those washers in, it was that tight. I will say, that even with a 0.05 increase, there seems to be a slight improvement in response. or is it in my head?

[marky]

put nos on it iff you really want a difference. plus uprated oil pump & oil cooler + ££££££££ for a new engine BANG!!!!!

[Healewis]

I'm saving the laughing gas for the 27 'T'

[marky]

whats 27t

[dandownunder]

If your boost gauge is still reading 7psi that means it is showing what the turbo thinks it is getting it's boost to. You may have to check where your boost valve is connected. Mine was origionally connected on the turbo, now with the Bleed valve it is connected inline with the Turbo Pressure sensor, which is behind the air filter. If you have a look on my website, under mods you'll see how I've done it(www.hiluxsurf.net). This will give you a true reading of the pressure in the manifold that the turbo is making.
The washers, 'confuse' the system, making the actuator think it's giving 7psi, when it's actually coming on later, giving you more boost, in my case I'm running 11.5 psi. i couldn't go anymore because the computer cut in and said it won't have any more.
hope that helps
cheers
Dan.

[NiftyNev]

Just tinkering on my truck, doing the belts and checking the levels, then my attention became focused on that turbo boosting thingymijig!! I have a turbo guage installed and the max it will go up to is 0.7, that's flat out, so just out of quriosity,I fitted the washers as described and adjusted it by 3/16ths of an inch. Then took my baby for a spin, the guage will only go up to 0.75. maye I should have spaced it more but, I struggled to get those washers in, it was that tight. I will say, that even with a 0.05 increase, there seems to be a slight improvement in response. or is it in my head?

Am I right in assuming your boost gauge reads in Kpa X 100? If so then .7 is 10.15 PSI and .75 is 10.87 PSI.Where do you have the gauge connected?

Neville

[Healewis]

To: niftynev, The guage is read in x100kva, I havn't looked to see where it has been connected, will check though, Cheers bud.

To: Marky, My 27"T" is a car I'm building for the NSCC (Nationat Street Car Chalenge) it should do the 1/4 in the low 12s without the laughing gas.

[jonesey]

Possibly with the inherent head problem that some of the 2.4t engines suffer , increasing the turbo boost is the last thing that we want to do.
Ems and Jim's comment was spot on,the extra pressure built up in the cylinders can only be bad news.
Being into the motorcycling Streefighters scene,a lot of turbocharged bikes are starting to emerge.Ok before anyone cuts me down, most are not originally turbocharged straight from the factory,however,the ones that have aftermarket turbos do not have standard engines.The 1000cc upward engine is pretty much bulletproof due to the lightness of the machine and would run a turbo day in day out with no problem.However the norm is to run a turbo with extra boost,for obvious reasons.
This doesn't happen on a standard engine because of the extra forces involved.They usually have welded and balanced crankshafts,hardened conrods and pistons.I know that a bike engine is going to be revving at maybe 13000rpm down the quarter mile,but it's all relative.
An option is maybe to fit a dump valve(that wooshing noise you hear when a Scoobie or Cossie goes by after he's been to Demon Tweeks).
This just dumps the gas in between gears to stop the turbo from stalling
,however this doesn't affect us autobox crew.
Well that's it,been away for a bit but have been keeping an eye on the forum,can't believe how big it's grown,feel quite proud to be a Surfer

[dandownunder]

Turbo's

I think you can boost the 2.4's if you have maintained a good service schedule, and looked after it generally. My 92 (which was made 10/92) has had a power up over here in Aus, which is a 2.5" exhaust and 11.5psi boost. i couldn't go any higher because the computer cut in and said overboost ((which is around the 12psi area) this in a way is re-assuring me that anything under 12 is safe, the 12 is a safe guard.
my opinion anyway, i do agree with the point of it shortening the engines life etc etc though, but a little bit more up and go won't hurt.
cheers
Dan

[wibblywobbly]

Turbo guru needed

First of all on the motorcycle turbo mod. A friend spent £3k fitting a Turbo to his 1200 Bandit. Totally standard crank, but stronger bolts etc. Stuck it on a dyno and the thing had gone from around 100bhp to 274bhp. The bike would spin the back wheel if he accelarated at 150mph. Totally unuseable in the real world though.

Now, back to the thread. I have a mysterious Surf:

I have a boost gauge. I also have a little digital thingy that says Turbo timer, I also have another digital thingy that has lights and numbers on it. I also have two switches that have been added on the right lower side of the dash.

I know what the turbo timer is designed to do, and yes the engine can take a few seconds to cut after removing the key.

The boost gauge never registers anything.
I haven't got a clue what the second digital display box does, and the two switches are a total mystery.

All that I do know is that the turbo makes a very loud whistling noise, and that when it initially cuts in, it is as if someone cut one of the cylinders?? There is no power surge, and I can put my foot through the floor with no effect after the first 25% of travel.

I will try and attach a pic of the turbo timer etc and if anyone can give me any pointers I would be extremely grateful.

[Delboy]

Has anyone else done this recently. I spaced min out by 1.5mm last ight and o have noticed a bit more pick up in the higher gears. A hill on the way home was always foot to the floor to stay at 60, and usually dropped to 55, but tonight i stayed at 60 with my foot 3/4 way down. Very impressed. I'm fully aware of the possible dangers but think its worth it.

[Guest]

Has anyone else done this recently. I spaced min out by 1.5mm last ight and o have noticed a bit more pick up in the higher gears. A hill on the way home was always foot to the floor to stay at 60, and usually dropped to 55, but tonight i stayed at 60 with my foot 3/4 way down. Very impressed. I'm fully aware of the possible dangers but think its worth it.

Yep I done mine, about the same spacing as you did and I have definately got more mid range grunt.

I was going to do it to just see what happened and then put it back however I like the extra torque now so I figure I will live with the consequences.

Cheers