Originally Posted by Stroock639

i'm simply asking which gear the car was in for the dyno run, if you don't know just say that... when i get my car dyno'd i wanna make sure both tests are done in as identical a manner as possible

and you always like to ignore that in the 'before' dyno run the car was down on power, and the extrude hone and cleaning simply brought the power back up to what it should be... if the 'after' run was like 250-260 whp, then we'd have something to talk about... but i'd bet that a simple thorough cleaning of the intake and throttle body would've produced the same results

Originally Posted by YODAONE

This is an automatic transmission, so "D".

Originally Posted by Stroock639

very cute... i sometimes wonder if you're the reason we never see puredrifter anymore lol

for all we know then the before run could've been done in 3rd gear and the after run in 4th, also explaining the reason for the before run being down on power (you still haven't addressed that issue)

we simply asked for some real world data, nobody cares about david vizard's chart... we're not denying physics... we're simply asking for some proof that it actually made a difference in the case of the 1999 LS

Originally Posted by YODAONE

1998 Lexus LS400 incorporated ACIS manifold to improve engine performance across the power curve.

A new heat barrier inake manifold gasket sandwiched resin in between two metal.gaakets...thereby reducing heat transfer from cylinder head to intake manifold.

However, Totota did not put the ribbon on the package.

The relatively enclosed area of the engine valley(where starter resides) reaches engine operating temperature of 185-200 F.....and has little if any ventilation, so as heat rises it is absorbed into bottom surface area of intake manifold...and dispersed into the manifold.

The intake manifold top area (visible through engine cover) is uncomfortably hot to the touch..

To remedy this problem and increase power across the curve (reduced temperature of intake charge increases power) , a thermal barrier applied underside the intake to shield it from engine heat..

Some images; This image depicts the heat barrier intake manifold gasket used on 1998 LS400. ..
Bottom view of ACIS intake manifold...while Lexus thermally isolated the intake manifold from the head at the ports with the new gasket design, it seemingly ignored the rest of the underside of the intake....




Both coolant crossover pipes run in close proximity tmparting heat.into intake
DEI Performane Products offers a thermal barrier that will block heat absorption ithrough bottom of intake manifold..
This is identical material used underside of plastic ram air assembly shown earlier in this post.....it is not yet tailored but presents the general concept . Contemplating whether to fill the underside pockets of intake with expanding foam for further heat isolation.
Upper half of ACIS manifold..
Another area that merits attention is the steel.gasket between upper and lower half of intake. Toyota determined that a non metallic gasket would reduce heat transfer between cylinder head to intake, but elected to not thermally isolate upper and lower half of intake manifold. Perhaps due to thickness and tolerance considerations. Anyone with suggestions here??.Spray coating thermal barrier compatible between Aluminum and steel??
Otherwise , suggestions on a thin yet durable non-metallic gasket material.

Originally Posted by YODAONE

1998 Lexus LS400 incorporated ACIS manifold to improve engine performance across the power curve.

A new heat barrier inake manifold gasket sandwiched resin in between two metal.gaakets...thereby reducing heat transfer from cylinder head to intake manifold.

However, Totota did not put the ribbon on the package.

The relatively enclosed area of the engine valley(where starter resides) reaches engine operating temperature of 185-200 F.....and has little if any ventilation, so as heat rises it is absorbed into bottom surface area of intake manifold...and dispersed into the manifold.

The intake manifold top area (visible through engine cover) is uncomfortably hot to the touch..

To remedy this problem and increase power across the curve (reduced temperature of intake charge increases power) , a thermal barrier applied underside the intake to shield it from engine heat..

Some images; This image depicts the heat barrier intake manifold gasket used on 1998 LS400. ..
Bottom view of ACIS intake manifold...while Lexus thermally isolated the intake manifold from the head at the ports with the new gasket design, it seemingly ignored the rest of the underside of the intake....




Both coolant crossover pipes run in close proximity tmparting heat.into intake
DEI Performane Products offers a thermal barrier that will block heat absorption ithrough bottom of intake manifold..
This is identical material used underside of plastic ram air assembly shown earlier in this post.....it is not yet tailored but presents the general concept . Contemplating whether to fill the underside pockets of intake with expanding foam for further heat isolation.
Upper half of ACIS manifold..
Another area that merits attention is the steel.gasket between upper and lower half of intake. Toyota determined that a non metallic gasket would reduce heat transfer between cylinder head to intake, but elected to not thermally isolate upper and lower half of intake manifold. Perhaps due to thickness and tolerance considerations. Anyone with suggestions here??.Spray coating thermal barrier compatible between Aluminum and steel??
Otherwise , suggestions on a thin yet durable non-metallic gasket material.

Originally Posted by YODAONE

Acquired Heat & Sound Barrier in 21" X 48" X 3/16" roll from DEI (Design Engineering, Inc.) Performance Products, Part # 050502.

Prepared paper templates, cut material to size and installed heat & sound barrier to the underside of the ram air box that runs across the top of the 185-200 F radiator.

As the material is 3/16" thick, it fit underneath the ram air assembly without clearance issues. After removing roll from box, allowed it to flatten overnight.before installing.
1st paper template

and second template..
Paper template shown on bottom of ram air assembly...There are three planes on the bottom so am applying material in three sections.
Close up showing slits cut in material to prevent puckering of material and facilitate conformity around curves.
Material cut to size and ready to remove pressure sensitive adhesive liner for installation.
Bottom of ram air assembly after intallation of heat barrier.

Used outdoor rated high temperature foil tape to seal slits and cover any gaps (nominal)

The DEI material incorporates a high temperature, high surface energy adhesive that works well with plastic.
Very satisfied with the results.
The ram air assembly fit without clearance issues..
Notice I worked around the OEM rubber isolation/damping strip..same material thickness as heat barrier.

Will acquire and present temperature readings soon