Turbos

benhomer737 · 7 Oct 2010 at 18:12

2 different engines completely, you should turbo yours, remember you cant Vtec a turbo, but you can turbo a Vtec

Relentless81 · 7 Oct 2010 at 18:14

benhomer737 said:
you cant Vtec a turbo, but you can turbo a Vtec

I was wondering how long that one would take

benhomer737 · 7 Oct 2010 at 18:17

its true though!

Bear · 7 Oct 2010 at 19:23

benhomer737 said:
2 different engines completely, you should turbo yours, remember you cant Vtec a turbo, but you can turbo a Vtec

Yes you can. Nissan has a VTEC turbo engine (SR20VET) which they put on some Japanese 4x4 for some unkown reason (X Trail GT). You can swap the SR20VET head with a bit of extra work onto a normal 200Sx SR20DET to get the VTEC with a turbo. Would need to change pistons and rods mind for the extra revs if you want reliability.

LizardKing · 7 Oct 2010 at 19:53

Matt82 said:
power is just a number imo. its the torque that gets you down the road

I'm not quite sure how you came to that statement, bhp is a multiple of torque :confused:

It gives a much better figure for comparison.

Torque is only the rotational force, pretty useless having oodles of torque at 1rpm.

Jonnycoupe · 7 Oct 2010 at 19:59

Meridian said:
On pretty much all turbo petrol engines surely, as once the wastegate opens it is regulating the engine power?

M

Most OEM cars yes as people like low end grunt. The wastegate will open as soon as you reach the desired boost pressure controlled by the actuator. Boost stays the same unless you have an incorrectly sized turbo and the wastegate could possibly close so all gas goes through the turbine in attempt to keep boost pressure. Therefore the torque falling away is due to the volumetric efficiency (how much of the air you can cram in) drops away.

adam cool dude · 7 Oct 2010 at 20:18

Relentless81 said:
Its not though really is it, DOHC VTEC is different to run of the mill VVT, you're thinking of plain old VTEC

Turbo provides torque, turbo's are also the viagra of the engine world, for those that cant do it naturally

Im pretty sure the VVL in the SR20 is easily a match for VTEC. Nissan Produced a 1.6 VVL engine with 200bhp. That demolished the ek9's 180 odd. The SR20VET produced 280bhp and the SR20VE found in the last generation JDM primera produced 205bhp.

loltim · 7 Oct 2010 at 20:20

LiamC said:
turbo > Vtec for performance
Vtec > Turbo for fun

What about vtec + turbo? :cool:

danza · 7 Oct 2010 at 20:48

Tim said:
What about vtec + turbo?

Expensive bills and oil leaks a plenty.

loltim · 8 Oct 2010 at 09:02

danza said:
Expensive bills and oil leaks a plenty.

Only if a complete **** built it?

Relentless81 · 8 Oct 2010 at 09:33

adam cool dude said:
Im pretty sure the VVL in the SR20 is easily a match for VTEC. Nissan Produced a 1.6 VVL engine with 200bhp. That demolished the ek9's 180 odd. The SR20VET produced 280bhp and the SR20VE found in the last generation JDM primera produced 205bhp.

Thats a totally different type of Nissan VVL though isnt it, its not the same as the one found in the SR20DET, the 1.6 VVL was very similar to DOHC VTEC, the SR20DET version wasnt

There are many different types of VTEC and many different types of ECU valve/cam control across all manufacturers its pretty daft to compare them

Mitsubishi have MIVEC, Nissan have VVL, Honda have VTEC, Toyota VVT-I, BMW have VANOS etc etc etc etc all based on the same basic idea but implented in their own way

danza said:
Expensive bills and oil leaks a plenty.

There are plenty of reliable daily driven Honda VTEC turbos on the forums I use but yeah if its not dont properly they arent very reliable at all

Matt82 · 8 Oct 2010 at 09:37

really? how do vanos and all the others increase lift?

Relentless81 · 8 Oct 2010 at 09:52

Being pedantic again are we?

ECU controlling parts of the engine in most basic form, I did also mention valve control

adam cool dude · 8 Oct 2010 at 09:58

Relentless81 said:
Thats a totally different type of Nissan VVL though isnt it, its not the same as the one found in the SR20DET, the 1.6 VVL was very similar to DOHC VTEC, the SR20DET version wasnt

There are many different types of VTEC and many different types of ECU valve/cam control across all manufacturers its pretty daft to compare them

I am pretty sure the SR20DET has no form or variable valve timing but please correct me.

Relentless81 · 8 Oct 2010 at 10:01

I wouldnt know the guy up the page says it has VVL, i've owned one and still dont know! I was dicussing how it doesnt behave like a DOHC VTEC engine does but with a turbo bolted on because it doesnt

Siliconslave · 8 Oct 2010 at 10:04

adam cool dude said:
I am pretty sure the SR20DET has no form or variable valve timing but please correct me.

the S14 SR20DET had Nissan's Variable Cam Timeing on the intake cam, the s15 had dual VCT so effective on both cams...

I'm sure you've heard of the dreaded VVT rattle?

Matt82 · 8 Oct 2010 at 10:13

Mr Slave, can it alter lift?

Relentless81 · 8 Oct 2010 at 10:13

Siliconslave said:
the S14 SR20DET had Nissan's Variable Cam Timeing on the intake cam, the s15 had dual VCT so effective on both cams...

I'm sure you've heard of the dreaded VVT rattle?

Ah yeah of course, mine sounded like it was dragging a load of coke cans behind it and was considered normal! Thankfully it only did it on warm starts but I only had the car three months, couldnt stand the thing

Matt82 said:
Mr Slave, can it alter lift?

No. The NEO VVL in the 1.6 altered lift, I think it was called NEO

Bear · 8 Oct 2010 at 10:23

Matt82 said:
Mr Slave, can it alter lift?

On the SR20DET no it doesnt only cam rotation but Nissans Neo VVL does.

Relentless81 · 8 Oct 2010 at 10:25

I wonder why Nissan didnt go fully into NEO and market as much as Honda did DOHC VTEC. At the time it was just as good if not better