Hi im new to this board and 300 zxs .Can anyone tell me the diffence thanks taff.I have a SWB TT MANUAL SLICKTOP

i think the 280 is due to drivetrain losses on the Auto. might be wrong though

I could be wrong, i could be right, all TT'S 280 except possibly the US market got 300?

I heard on here its because manuals and autos have diffrent turbos .Is this right.cheers taff

dont think so. its just that Autos sap more power than the manual.

Again not 100% but, yes different sized tubs but also different engine components to negate the difference.

really? so the auto has bigger turbos than the man?! do manual owners swap for auto turbos to increase performance?

what parts differ between the two models? i would have thought the easiest way to increase the power to match would be simply modify the map a bit.

Auto turbo's are smaller than that on the manual and are slightly slower to 60 but I have heard they are quicker overall to 100 mph. I will stand corrected if I am wrong.

Borrowed this from a previous post, cheers.

 

Taken from the FAQ section of TT.NET...

 

Does my automatic Twin Turbo really have 20 horsepower less at the flywheel?

 

Yes. I couldn't believe it, based on the performance of the two cars, so I did some research.

I found two quotes from books written about the Z:

 

"The four speed automatic was also available in the Turbo but in deference to the auto boxes longevity, the engines power output was cut back to 280bhp by different camshafts and fuel injection maps. Torque remained the same." From: Illustrated DATSUN/DATSUN Sports Car Buyers Guide by John Matras.

 

and:

 

"For various reasons the 300zx Turbo in some versions is rated at 280bhp. This applies to the Japanese market, where the manufacturers have an agreement to limit outputs to 280, to automatic trans models in the US, which have different camshaft profiles and fuel injection settings, and to the European market 2+2 because of its setting for lower-octane unleaded fuel." From Nissan 300ZX - The Enthusiasts Companion by Ray Hutton

 

I asked people I know at Nissan USA and Nissan Japan to confirm the horsepower rating of TT's with automatic transmissions.

 

The response I got from a contact at Nissan USA was:

 

"Aside from minor changes in the ECU, the cam profiles & turbos are also different between the M/T & A/T models. The A/T has 240 degree intake cams & 248 degree exhaust cams (the M/T has 248 degree cams for both intake & exhaust). Also, the A/T uses smaller turbos for more responsive low speed acceleration (the A/R ratio is 0.63 for the M/T & only 0.54 for the A/T). Even with 20HP less, the A/T turbo is capable of beating the M/T turbo to 100MPH."

 

I checked the fiche in the 'DOCS' section:

 

There were always different ECU's for manual and auto cars.

 

The camshafts were always different on the autos until the 1996 model year, and the part numbers changed three times. In 1996, Nissan discontinued the variable valve timing system, and rated the TT engine at 280 HP.

 

The exhaust manifolds (from the cylinders to the turbos) are the same for all years.

 

The turbos were always different (see Nissan USA comment above). They went through two part number changes on the right hand one, and three on the left hand one.

 

The exhaust housings (which attach the pre-cats to the turbos) were different for manuals and autos only from 9/93 to 9/94.

 

The manual and auto had different pre-cats, and the part numbers changed three times from 1989 through 1995. Both cars used the same pre-cat for the 1996 model year.

 

The H-pipe was the same for both manual and auto cars throughout production.

 

The main mufflers were different throughout production - even for the 1996 model year.

 

The auto has a different radiator, to accommodate the need to cool the transmission fluid. There were no part number changes throughout production.

 

From all of the differences in components, it's pretty clear that Nissan did some serious engineering to get the two cars to perform much the same way even though the auto model is down 20 HP.

really? so the auto has bigger turbos than the man?! do manual owners swap for auto turbos to increase performance?

what parts differ between the two models? i would have thought the easiest way to increase the power to match would be simply modify the map a bit.

 

 

no the auto has smaller turbos due to the slight drive loss of an auto smaller turbo housings spool quicker than a manual turbo so manual owners can opt for auto turbos to give a very slight increase in turbo response,also autos have slightly differant cams

 

HTH greg

 

ps..all this talk of 280 or 300hp is pants there all the same infact by now no 300 will give the same reading on a dyno ;)

280ps is the rated hp in the jap market, they are not allowed to produce over 280 and since all these originate in Jpan, they were all manufactured with the same parts & rated the same as the original production models in japan. Auto / manual make absolutely no diff as the power quoted is @ fly. There were rumours that they under-rated the power by a small margin to comply with the regulations in the east, but these are mostly rumours at best. Most stock Z's I have seen on the rollers have been lucky to produce the full 280 anyway because of age or wear. So either way anything you get will probably be around 270+ mark unless it has been modified.

 

Auto's do have smaller tubbs, but TBH you's be pushed to notice diff, both manual and auto housings / compressors can flow up to 15.8 Psi b4 maxing out.

 

A 300hp Z out of the factory is *****x I am affraid.

 

Cheers

that answers my question then, cheers

FFS two huge replies in the time it took me to type that, there was fk all here just now lol. And autos spool much better, especially with that large bore dp baby :D

FFS two huge replies in the time it took me to type that, there was fk all here just now lol. And autos spool much better, especially with that large bore dp baby :D

 

get back in a z and stop moaning ;)

Thanks for info guys.I also found info about jdm cars having a 1.5" inch restrictor fitted before the cat not found on us market or european cars.Is this a power restricter to keep jap cars hp down to the argrement with jap car manufacurers of 280 bhp. thanks taff

They have precats if thats what you mean? and UK cars have em. You can just rip it out and gut em with a wire coathanger lol.

 

And Greg, why dont you get back in a z lol! you know my views ;)

Borrowed this from a previous post, cheers.

 

Taken from the FAQ section of TT.NET...

 

Does my automatic Twin Turbo really have 20 horsepower less at the flywheel?

 

Yes. I couldn't believe it, based on the performance of the two cars, so I did some research.

I found two quotes from books written about the Z:

 

"The four speed automatic was also available in the Turbo but in deference to the auto boxes longevity, the engines power output was cut back to 280bhp by different camshafts and fuel injection maps. Torque remained the same." From: Illustrated DATSUN/DATSUN Sports Car Buyers Guide by John

 

 

 

FOOKIN hell will have to get me ZED books out now :rolleyes:

this link will answer your question for good ;)

 

http://www.300zx.co.uk/forums/showthread.php?t=50859

Thats a post and a half mate, and still doesn't really answer it lol ;), I say 270 for all stock Z's 6yrs+ old lol!

So then, all this talk about cam profile etc and tub's being bigger and smaller is interesting but what happens when a auto is converted into a manual. How are all these changes put right. Or are we talking minimal output notice? Just wondering about this as Nissan spent so much time producing these cars to the same spec with different drives and then we go and change it.

So then, all this talk about cam profile etc and tub's being bigger and smaller is interesting but what happens when a auto is converted into a manual. How are all these changes put right. Or are we talking minimal output notice? Just wondering about this as Nissan spent so much time producing these cars to the same spec with different drives and then we go and change it.

 

my TT was converted once my autobox bust - TBH i noticed slightly less performance in a straight line, but then again the kit was 2nd hand and could be in any condition. :( should have fitted an RPS clutch instead of winging it with the 2nd-hand one

Taff,

 

You have a SWB TT Slicktop Manual!! :bow:

 

I hope its not in Gunmetal or im going to have to come and borrow it for a day!! :D

 

Welcome to the club buddy!

 

Rich

No its pearl yellow mate I understand swb tt slicktops are rare in the uk be it manual or auto.Do you know of any other ones . A freind of mine had one about 3 yrs ago it was a g plate swb tt auto BUT t-top in gunmetal grey with a se wing on the back.Thats what made me buy one.Had 3 nissan 200 sxs before .Brought from an importer last month spec is TEIN FLEX \ARC TENSION RODS\TRUST EXHAUST\MINES ECU\HKS SPF\TRY FORCE ZELDA 3 SPOKE DEEP DISH WHEELS 8" and 9"/HKS TURBO TIMER\HKS GAUGES/HKS PODS /BACK LIT REAR PANEL NISSAN ONE/.Cheers taff :dance:

i think the 280 is due to drivetrain losses on the Auto. might be wrong though

 

As the power is quoted at the flywheel, not the wheels drivetrain losses make no diffrence to quoted BHP.

 

As everyone has said, out of the factory only US manwells were quoted at 300bhp. All other TTs were supposedly 280bhp

 

Richard :cool:

i have read cars in japan were not allowed to be over 280 bhp (gentlemens agreement) this wasnt the case the zed which is 300bhp, supra 326 bhp approx and the skyline is 280bhp i dont think so. alot of cars are quoted as 280 bhp but arent. i read that the fuel made a differance aswell 101 jap to 95 uk. thing is none of us hardly leave them standard so whats the beef there a quick car. on the manual to auto conversion is the differance that little because i have a nissan book quoting

0-60 as 5.6 manual and 6.1 auto which to me isnt bad for an auto

on the manual to auto conversion is the differance that little because i have a nissan book quoting

0-60 as 5.6 manual and 6.1 auto which to me isnt bad for an auto

 

there'll be some differences between a 'natural' manual Z, and an automatic Z converted to a manual. performance-wise however there won't be much in it. some say the auto tubbies are better in a manual.