Toymods Car Club Inc: Miscellaneous => 1JZ Dump Pipes Group Buy

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celicamad
Forums Junkie

Location:
newcastle
Registered:
June 2002

Re: 1JZ Dump Pipes Group Buy

Sat, 21 August 2004 23:49

Quote:

just because a car is stock and doesnt mean it will run less boost, it just doesnt breath as freely as a modified car and wont reach full boost unless operated in prime conditions.

Umm imn sorry this is totally incorrect opening up an exhaust WILL increase boost on stock 1j . And in most situations on any turbo car .
removing a restriction in an exhaust allows MORE air past the exhasut wheel making more boost

stock boost on most 1js is 9 psi and 11 psi with dumps and free flowing exhaust .

with SOME exhaust designs boost has been as high as 14 psi without even a boost controller fitted

THE REAR TURBO DOES NOT HAVE TO BE REMOVED !!!!

These dumps look quite ok and are a copy of the original dumps we had made about 5 years ago .

The bends are a little sharp but the price is good
It seems a lot of people have misunderstood the design of the original dumps and their purpose .

JUST ADDING DUMPS WILL MAKE VERY LITTLE DIFFERNCE THE ENTIRE EXHAUST SYTEM NEEDS TO BE UPGRADED

Yes removing the restriction gives a good power gain .
The amount of power gained is relative to boost
at 16 psi good dumps will provide around 40 h.p @ wheels .

The BIG gain is mid range power delivery and torque

in order to get this much increase you need either twin cats or no cat and VERY high flowing exhaust . Ie all mandrel bends good mufflers

The dumps used to get the 40 h.p gain where much smoother particularly the bend at the first flange and they do not rejoin for about 1.5 metres under the car .

This ensures a massive reduction in heat both under bonnet and at the exhaust wheel but also get more air past the turbo faster . spool up time is reduced

although seperate wastegate dumps should in theory work better .the design we made like the Martin donnan ones gave a fatter midrange but seemed to make only minor gains in the top end .

The lastest generation dumps i had made give a HUGE midrange power increase and with considerably better spool up time PLUS the top end power curve is still smooth
0-100 times dropped to 4.69 secs and i think the 8.58 1/4 mile at dubbo (fastest stock turbo 1j) says it all

DEATILED photos of these will be avialable on my webpage in the next few weeks .THEY WILL NOT BE FOR SALE
http://www.hiperboost.com

however for the price these dumps look fine bang for buck cant argue.Just make sure the rest of the system is good enough to allow the dumps to actually work

the end result depends ENTIRLEY on the length of the 2.5 inch pipes then the total amount of flow the rest of the system can provide

the big thing to remember is that dumps allow higher boost to be run constantly without fear of killing turbos

MX83 toy

it may be worth adding that dumps will not fit ANY car they need to be specifiaclly manufactured to fit soarer,supra,cressdia etc. The postion of the steering arm causes this .

does this guy have a set of dumps for each specific vehicle or will he only make to fit certain cars

for the price these dumps look great !!!!!!

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