355 Gruppe M system

Kevin, thanks for the extra prompt reply. I look forward to your PM. Lloyd

 

Kevin,

I like the potential improved performance AND the looks of the Gruppe M. I have my doubts about the +24 whp claim, hence the need for the dyno results.The manifolds only offer the performance part of the equation (not the looks).

Thanks,
Tim

 

This was at a NSX club dyno day event in Huntington Beach a couple years ago. The guy that had the 355 sold it and owns a 360 now. I will call him and ask what the exact gain was and if he still had the dyno sheets when I get back in town. I clearly remember over 20 hp gain from the runs that were about an hour apart in an overcast day while they installed the intake. I believe he may have an exhaust on the car at the time. Mr O (owner of Gruppe M was present to do the install, he was there primarily to help with people that have his supercharger on the NSX I believe) and I am not sure what else may have been done...or the conditions of the stock air filters...it could have been filthy compared the the new Gruppe M intake. My memory tells me that it was either 24 or 29 hp gain. I decided to go with the lower one since I am not sure. I made 19whp that day with the removal of cats and replaced the 1991 NSX exhaust with a later model year unit from a 3.2 liter NSX.

 

I just got off the phone with Mark at SP-Engineering and he said nobody from there company was at the dyno day. I have forwarded him the link so he may chime in soon.

There is no proof of the 24whp dyno gain. That was misinformation by fuse, now there might have been a 24whp gain but SP-Engineering had nothing to do with that dyno from what I understood. Alex apparently has also never owned a silver F355 as fuse claimed in the thread so I'm not really sure I believe what this guy is saying unless he can say otherwise.

Regards,
Kevin

 

I never knew Alex owned a 355!! LOL!! I don't know how our company became involved in this, but hey more power to us!! If anyone is interested in the Gruppe-M i'll get them for you guys..but I have to state that we never OWNED/DYNOED ANY 355!! We have sold many and have seen great improvements with the Gruppe-M intakes, but as far as 24 HP gains go, there is no way to prove it unless we personally do the testing again. This RUMOR IS FALSE!!

 

Here's the 360 gruppe m setup. Before and after.
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Don't get me wrong, there is a performance change. Throttle response and power gains are there, but they are minimum. You can definetley notice it right away. But, it's more of a cosmetic upgrade.

 

I was never claiming Alex owned a 355. He said Alex and said the U.S. distributor for Gruppe M and I was saying Yeah Alex from SP Engineering to that. I honestly don't care what Alex drives or owns, that is none of my concern. Thank you for coming in here and clearing up the rumor however.

Regards,
Kevin

 

That dyno day was at UPRD (no longer in business) about 4 years ago. Mr. O from GruppeM Japan brought the first demo unit to be installed on F355 5.2 and after the dyno the computer showed 20+ hp gain. However, later that day I was told that the dyno was bit off and the technicians were having some problems with it. I believe no one got their dyno sheet from that event.

 

Gentleman, go to nsxfiles.com, and find out that doug hayashi nsx and 355 owner has a long story on this. The yellow 1999 355 gts that was dyno'd was owned by wayne mello (had a mille miglia exhaust)who owned 1800phoneguys in huntington beach.
Here is a direct link to the site http://nsxfiles.com/stories.htm click on "chapter 50-can't live without f355".

 

Thanks, read through it...10hp at the wheels gain.

Hmmmm.

 

In my opinion 10whp is still more then I expected. Very impressive out of an intake alone and while it's not a huge seat of the pants feel I'm sure an F355 equipped with test pipes/hyperflo, NAPerformance Exhaust Manifolds, Gruppe-M, Powerchip Tuning, and Capristo Exhaust would have a huge difference compared to the regular 355. Just think how smooth,responsive, and powerful that setup would be compared to stock.

 

$3000 for 10hp? Oh, and it looks cool, of course. Of course we spend as much or more for a Tubi and it probably gains LESS than 10hp, but it sounds so seductive.....

But taking what you are suggesting would cost what? $13,000?! Plus installation.

 

$13,000 is pretty high but in this game you gotta pay to play. I just think it'd be very interesting to see an F355 with the bolt-ons I suggested run a stock F355 so we could see real life differences.

$3,000 for 10hp but you get a very clean engine bay, and improved throttle response. In my opinion it's for some people and it's not for others. Modding is a very expensive and addicting habit.

 

I will choose not to "play".

 

I had an as new condition Gruppe M Air intake for 355 for sale ($1800) on this site a few weeks ago and only 4 people emailed me with a very little interest. I ended up selling to a guy from London for a bit less and I have to deliver it to him in London next week! Where were you guys? I could sold it localy (at least in the U.S.).

I sold it because I sold my 355 long time a go. I did like it a lot. It was a very nice system (best one I think even today) That is why I kept it all this time just incase. But now I sold my 360CS and I have my F430 and I didn't see myself getting another 355 anytime soon.

 

Sounds like a hard decision indeed, but if it was me I'd take the intake. In my opinion the F355 is one of the few cars the stock wheels look better then most aftermarket ones. However if we're talking a 360, I'd take the wheels without even thinking. Either way Martin I think you'll be happy with your decision.

Regards,
Kevin

 

After getting a few emails about running some sort of special I've put the 355 Gruppe M on special for this summer at $2,775.00. Note that you must be an f-chatter to get this deal.

http://store.yahoo.com/nonturbo/gruppemintake.html

Regards,
Kevin

 

Hi All,

I don't normally post in this forum (but have been lurking for the past several months, maybe even years, just absorbing all the info like a sponge ;-), but now I feel the need to respond to save the face of a good, long time friend of mine, Fuse. *I* am the "Alex" he was talking about in his response to this thread. And I have no connection whatsoever with SP Engineering. And, yes, it is no rumor that I also own a 355. It was NA Performance who hastily linked Alex and SP Engineering together.

Anyway, just a brief background. I have been a very long time NSX owner and enthusiast, and have been very active in organizing most, if not all of the NSX Club events, drives, track events, and other get togethers in the SOCAL area (and some at a national level) back in the mid-90's to around 2002. I am also one of the founding members of the NSX Club of America, of which I am also a past-president.

Through the course of my dealings with the NSX and the club, while in Japan I met Mr. O, the owner of Gruppe M, Inc., and since then we became very good friends. I eventually became the first exclusive importer of Gruppe M parts for the NSX, and have been supplying the NSX community with Gruppe M parts since 1998.

Anyway, I was the one who organized the dynoday in question, which was held in 02/00 BTW. It is true that they were having some problems with tire/drum slippage earlier that day, but I think in the end we got some fairly decent runs. The strange thing was that the printouts (yes, there were printouts) appeared rather weird as the graphs appeared jagged as compared to most dyno printouts I have seen. I think the smoothening setting (correct term?) was not adjusted properly. The torque figure was also missing on all of the printouts, but we got max RWHP. Needless to say, the dynoday fell a bit short of our expectations due to some technical problems, but I think in terms of max HP and its comparison to one another, we had the data we wanted. Oh, and nobody else had the printouts, because *I* have them all

Mr. O was present during that dynoday, and he had with him a sample of his intake system for the 355. We did a back to back dyno run on Doug's '98 GTS, and with the installation of the intake as the only difference between the runs. Wayne also decided to drive the car himself, not entrusting the techs to do it, without Doug's presence.

I am looking at the dyno sheet right now, and there "appears" to be a 22 hp gain with the intake, at 7800 RPM, with a 20-24 hp gain from 5600 rpm on up. Wayne decided to lift short of the redline, as he did not want to take any risks as the owner of the car wasn't present at that time.

So there it is. You can chose to believe that data or not. But based on my past experiences with Gruppe M's products with the NSX, I have little reason to doubt it. I would love to repeat the test with my 355 under a more controlled situation, with a more accurate dyno. But I am still waiting for my intake system

It is late and I don't feel like scanning the dyno sheet right now, but at least I found it. If anybody is still interested, let me know and I can try to do so over the weekend.

That's the end of my soapbox, and I'll go back under the rock I crawled out of.

<VBG>

Regards, Alex

 

Alex,

Apologize for mixing you two together, but I appreciate the information. Is there anyway you could scan the graph or fax it over to me? I'd love to have it.

Regards,
Kevin